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The analysis of thyroid nuclear proteins by polyacrylamide gel electrophoresis has demonstrated that thyrotropin and dibutyryl adenosine 3':5'-monophosphate stimulate specifically the phosphorylation of H1 histones in an intact cell system. This effect does not require new protein synthesis and implicates the phosphorylation of secrine residue(s) situated in the N-terminal part of H1 histones.
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Lamy et al. (1977) studied this question.
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