title: From 48 to 46: cytological technique, preconception, and the counting of human chromosomes.
mesh_terms: D003585:Cell Biology / Q000266:history*; D002875:Chromosomes; D003584:Cytological Techniques; D005260:Female; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D008297:Male