electrophoretic analyses of the proteins extracted by 0.75 m perchloric acid ( pca ) or by 0.35 m nacl from round and non-round spermatids , separated by centrifugal elutriation , showed that the four major hmg proteins disappear from nuclei in the oldest round spermatids , at the time the nuclear content of protein 2r and histone h1 ( 0 ) increases in spermatids .
C0007610
nuclei
C0028589
nuclear