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The lactogenic activity (L.A.) of oPRL and hGH derivatives obtained by chemical modifications of lysine residues was studied by radioreceptor assay. Control treatment with borohydride had a slight effect on the L.A. of hGH but drastically reduced the oPRL activity; this latter was preserved in the presence of iodoacetamide. Methylation, ethylation, guanidination and acetimidination affected the L...
The biological activities of several ovine chorionic somatomammotropin (oCS) derivatives obtained by chemical modification of the lysine residues were studied by radioreceptor assays using rabbit mammary homogenates (lactogenic activity, L.A.) and liver homogenates (somatotropic activity, S.A.). Even if the control treatment with BH -4 markedly decreased the L.A., it was clear that methylation...
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