Abstract
The amino acid compositions and the electrophoretic properties of secreted mouse prolactin (mPRL), mouse growth hormone (mGH), and hamster prolactin (haPRL) were determined. The amino acid compositions of secreted mPRL and haPRL were similar to the compositions of other rodent prolactins, except that secreted mPRL contained only one tryptophan residue rather than the usual two. The composition of secreted mGH was similar to that of rat growth hormone. On 10% alkaline polyacrylamide gels, mPRL, mGH, and haPRL migrated with R f 's of 0.54, 0.21, and 0.69, respectively. The molecular weights of mPRL, mGH, and haPRL, determined by SDS-gel electrophoresis, were 23,000, 21,000, and 22,000, respectively.
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