Multiple forms of H4 histone mRNA in human cells.

Abstract
Two species of H4 histone mRNA were isolated from the polysomes of S phase HeLa [human cervical carcinoma] S3 cells. Electrophoresis under denaturing and nondenaturing conditions indicates that the 2 H4 mRNA differ in size. Both mRNA translate H4 histones in vitro, lack poly(A) at their 3'' termini, and are capped at their 5'' termini. Polyacrylamide gel electrophoresis and tryptic peptide analysis suggest that the polypeptides synthesized by the 2 mRNA are indistinguishable.