title: Crossing-over during human spermatogenesis visualized cytologically.
mesh_terms: D002905:Chromosomes, Human, 4-5 / Q000648:ultrastructure; D002906:Chromosomes, Human, 6-12 and X / Q000648:ultrastructure; D003434:Crossing Over, Genetic; D005260:Female; D006801:Humans; D007223:Infant; D007621:Karyotyping; D008297:Male; D011110:Polymorphism, Genetic; D013091:Spermatogenesis