The microscope in early embryological investigation.
D000818:Animals; D004626:Embryology / Q000266:history*; D005260:Female; D005306:Fertilization; D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D006801:Humans; D008297:Male; D008853:Microscopy / Q000266:history* / Q000295:instrumentation; D055095:Optics and Photonics / Q000295:instrumentation; D010063:Ovum / Q000166:cytology; D013094:Spermatozoa / Q000166:cytology