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Human
Male
Support, Non-U.S. Gov't
human
72
Female
50
article
46
priority journal
46
male
42
Adult
32
human cell
32
Middle Age
28
female
28
adult
26
Adolescent
22
Aged
18
Animal
18
Child
18
Child, Preschool
18
Spermatozoa
18
adolescent
16
controlled study
16
male genital system
16
aged
14
normal human
14
spermatozoon
14
Erythrocytes
12
Rats
12
major clinical study
12
Comparative Study
10
Epididymis
10
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