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Eight-cell mouse embryo, light micrograph

Sixteen-cell mouse embryo, confocal micrograph

IVF embryo, light micrograph

IVF embryo, light micrograph

IVF embryo, light micrograph

IVF embryo, light micrograph

Mouse embryo, fluorescence micrograph

Bat embryo, light micrograph

Frog embryo, morula stage

Natal long-fingered bat embryo

Lesser-spotted dogfish embryo, light micrograph

LM of human embryo at four-cell stage

Mouse blastocyst, confocal micrograph

Mouse blastocyst, confocal micrograph

Mouse blastocyst, confocal micrograph

Mouse blastocysts, confocal micrograph

Bat embryos, light micrograph

Stem cell embryology research

Stem cell embryology research

Mouse embryo, light micrograph

Veiled chameleon embryo skeleton

Foetal mouse foot, SEM

Ten day human embryo, fluorescence micrograph

Eleven day human embryo, fluorescence micrograph

Zebrafish embryo SEM X100

Pig embryo

Cow embryo

Cat foetus, SEM

Cat foetus, SEM

Stem cell embryology research

Stem cell embryology research

Stem cell embryology research

Cat foetus, SEM

Cat foetus head, SEM

Dividing bacterium, SEM

Salmonella bacterium dividing, SEM

Ovary, LM

Ovary, LM

Frog embryo, light micrograph

Ten day human embryos, fluorescence micrograph

Frog embryo, neurula stage

Frog embryo, tail bud stage

16-cell human embryo on a pin, SEM

Natal long-fingered bat embryo

Mouse embryo, light micrograph

Cosmarium desmids, light micrograph

Desmids and red algae, light micrograph

Desmids and red algae, light micrograph

Pig embryos

Cat foetus

Monkey foetus

Plant embryo, light micrograph

Plant embryo, light micrograph

Arabidopsis thaliana embryo, micrograph

Common spangle galls on an oak leaf

Neuroblast cells, fluorescent micrograph

Stem cell embryology research

Stem cell embryology research

Zebra fish embryo, SEM

Pig Embryo development, LM

Pig Embryo development, LM

Pig Embryo development, LM

Chicken embryo at 30 hours of development, light micrograph

Chicken embryo at 36 hours of development, light micrograph

Chicken embryo at 66 hours of development, light micrograph

Desmid zygote, light micrograph

Desmid zygote, light micrograph

Desmid zygote, light micrograph

Desmid zygote, light micrograph

Mouse brain, fluorescent micrograph

Chicken embryo, light micrograph

Karl Ernst von Baer, German naturalist

Foetal gibon twins

Johannes Holtfreter, embryologist

In vitro fertilisation, light micrograph

Ovulation and fertilisation, artwork

Spermatogenesis in mammalian testis, light micrograph

Micrasterias desmid dividing, micrograph

Bird reproductive organs, artwork

Small spotted catshark embryo

Apoptotic muscle cell, SEM

Muscle myoblast extracellular matrix, SEM

Chlamydia bacteria, TEM

Dividing yeast cells, SEM

Dividing yeast cells, SEM

Rat kidney glomerulus

Rat kidney glomerulus

Rat kidney glomeruli

Netrium desmid dividing, micrograph

Amoeba proteus dividing, light micrograph

Amoeba proteus dividing, light micrograph

Amoeba proteus dividing, light micrograph

Developing frog egg, light micrograph

Cave shrimp, SEM

Mouse brain, fluorescent micrograph

Staphylococcus aureus bacteria

Stem cell embryology research

Stem cell embryology research

Stem cell embryology research

Stem cell embryology research

Stem cell embryology research

Stem cell embryology research

Liver lobules, light micrograph

Sea squirt's gills, SEM

Extragonadal germ cell tumour, light micrograph

Extragonadal germ cell tumour, light micrograph

Fish embryo, light micrograph

Chicken embryo at 33 hours of development, light micrograph

Chicken embryo at 40 hours of development, light micrograph

Cuttlefish embryo research

Cuttlefish embryo research

Villi in mammal small intestine

Stomach surface and wall section. SEM

Villi in th small intestine

Camembert

Tabby cat emerging through cat flap

Flock of greater flamingoes foraging

Zebrafish

Zebrafish

Developing fish egg, light micrograph

Chick development, LM

Paired chick development, LM

Chick development, LM

Chick development, LM

Abnormal chick development, LM

Chick development, LM

Paired chick development, LM

Developing fish fin, SEM

Developing fish fin, SEM

Blastocyst implantation, diagram

Hedgehog foetus, SEM

Hedgehog foetus, SEM

Hedgehog foetus head, SEM

Sperm, SEM

Sperm, SEM

Sperm, SEM

Sperm, SEM

Sperm, SEM

Sperm, SEM

Sperm, SEM

Sperm, SEM

Dog and his food separated on two pedestals

IVF treatment, light micrograph

IVF treatment, light micrograph

IVF treatment, light micrograph

Chameleon embryo tail bones

Chameleon embryo tail bones

Secretory epithelium, light micrograph

Epididymis epithelium, light micrograph

Epididymis epithelium, light micrograph

Epididymis epithelium, light micrograph

Epididymis epithelium, light micrograph

Epididymis epithelium, light micrograph

Epididymis epithelium, light micrograph

Cassowary egg

Emu egg

Ostrich egg

Cell division, SEM

Cell division, SEM

Cell division, SEM

Cell division, SEM

Cell division, SEM

Cell division, SEM

Cell division, SEM

Cell division, SEM

Dividing HeLa cells, SEM

Dividing cancer cells, SEM

Dividing HeLa cells, SEM

Dividing cancer cells, SEM

Dividing cancer cells, SEM

Convict cichlid fish scales and skin, SEM

Mouse mammary tumour virus, TEM

Seeds, SEM

Seeds, SEM

Seeds, SEM

Scutellaria seed, SEM

Chaenorhinum seed, SEM

Nemesia seed, SEM

Nemesia seed, SEM

Chaenorhinum seed.

Scutellaria seed.

Mosquito larva, light micrograph

Mosquito larva, light micrograph

In vitro fertilisation, light micrograph

In vitro fertilisation, light micrograph

Woodmouse foetus, light micrograph

Foetal rat head, light micrograph

Squid embryo, light micrograph

Spermatozoa of a dog by van Leeuwenhoek, 1685

Spermatozoa of a rabbit by van Leeuwenhoek, 1685

Cooked lobster

Egg and embryo skeleton, CT scan

Human prostate gland, light micrograph

Mouse embryo heart, SEM

Mouse embryo heart, SEM

Convict cichlid fish scales and skin, SEM

Convict cichlid fish scales and skin, SEM

Convict cichlid fish scales and skin, SEM

Convict cichlid fish scales and skin, SEM

Convict cichlid fish scales and skin, SEM