i have compared the quantity and the length of the poly ( a ) tracts of five haploid-expressed mrnas in the polysomal and nonpolysomal fractions of round and elongating spermatids in mice : transition proteins 1 and 2 , protamines 1 and 2 , and an unidentified mrna of about 1050 bases .
C0037857
spermatids
C0146524
transition proteins 1