scatchard analyses of specific [ 3h ] r1881 binding to the same cultured skin fibroblasts of young and aged men showed a single class of high-affinity binding sites with a mean bmax of 5.77 +/- 1.02 x 10 ( 3 ) and 2.82 +/- 0.97 x 10 ( 3 ) sites/cell , respectively , and a mean kd of 0.56 +/- 0.23 and 0.50 +/- 0.28 nm , respectively .
C0016030
fibroblasts
C0007634
cell