the nuclei were isolated from boar spermatid or sperm cells at three distinct stages of spermatogenesis : just before the completion of a maturation process in the testis ( late spermatid ) , immediately after a subsequent transformation into spermatozoa ( caput spermatozoon ) , and after full maturation ( cauda spermatozoon ) .
C0037864
spermatogenesis
C0037868
spermatozoon