Animals 6 Male 6 Spermatogonia 6 male 6 animal 4 article 4 nonhuman 4 spermatogonium 4 Abnormal Karyotype 2 Animalia 2 Apoptosis 2 Article 2 Astacoidea 2 Autosomal fusion 2 B chromosome 2 C57BL mouse 2 Caffeine 2 Cell Proliferation 2 Central Nervous System Stimulants 2 Cherax quadricarinatus 2 Chromosome Banding 2 Chromosomes, Insect 2 Cocaine 2 Cytoplasm 2 DNA Primers 2 DRD2 protein, mouse 2 Decapoda (Crustacea) 2 Dopamine 2 Dopamine Uptake Inhibitors 2 Drd1a protein, mouse 2