Humans male priority journal Male 383 human 373 article 316 controlled study 301 female 297 Female 282 adult 245 Adult 190 Middle Aged 164 nonhuman 110 aged 108 Aged 106 major clinical study 106 human cell 103 Animals 98 clinical article 94 protein expression 72 Article 69 animal experiment 68 Argentina 66 animal cell 63 Adolescent 60 Mice 51 metabolism 51 middle aged 50 mouse 49 human tissue 47