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How many amino acids are in prolactin? 

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The deduced complete amino acid sequence indicates that the precursor molecule consists of 31 amino acids as the signal peptide and 197 amino acids of prolactin, in which two amino acids were found to be different from the amino acid sequence previously published elsewhere.
Thus, this study demonstrated that the seven amino acids in the amino terminal region contribute to the biological function of rat prolactin and that tyrosine at 42 is especially important.
Since with this method we can determine over 40 physiological amino acids with a very good resolution, trace amounts of amino acids can also be determined.
Open accessJournal ArticleDOI
Paul K. Stumpf, D.E. Green 
116 Citations
There are at least several enzymes which are involved in the oxidation of twentytwo amino acids by young suspensions of Proteus vulgaris.
Proteolysis of the protein preparations obtained with the use of two enzymes was more favourable, particularly due to the quantity of free amino acids in and amino acids composition of the hydrolysates.
These findings suggest that prolactin actively supports lactation providing amino acids to the gland through SNAT2 for the synthesis of milk proteins.
Of all the amino acids, proline has the strongest effect.
Our data suggest that the occurrence of additional amino acids that are widely distributed and genetically encoded is unlikely.
The amino acid composition of the purified avian prolactin closely resembles that of mammalian prolactin preparations and the isoelectric point is also similar in both cases.

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