the results indicate ( a ) that there is no correlation between the relative levels in lactation rough microsomes of the two microsomal proteins which become prominent during lactation and the extent of secretory activity and ( b ) that for a short period after parturition the rough er elements bearing high surface densities of ribosomes have a greater proportion of ribosomes synthesizing milk proteins than the rough er elements with moderate ribosome densities .
C0230779
rough er
C0035553
ribosome