the subsequent increase in receptor number with age is due both to an increase in alpha-sctx-labeled cells ( to 53 % and 97 % at days 15 and 18 , respectively ) and to an increase in the receptor density on these cells ( 10.9 , 12.7 and 34.5 silver grains/1000 microns2 of cell surface for the 3 stages studied ) .
C0007634
cells
C0699040
of cell surface