this decrease may be accounted for by decreased capacity of cholesterol side-chain cleavage which decreased ( in the presence of 25-hydroxycholesterol ) from 1.68 +/- 0.26 on day 0 to 0.74 +/- 0.48 on day 2 ( microgram/60 min/mg protein ; mean +/- sd , n = 4 ) and decreased activity of cyclic amp-dependent protein kinase ( as apparent from a direct assay of protein kinase activity and the extent of phosphorylation of lh-dependent phosphoproteins ) .
C0033684
protein
C0031689
phosphoproteins