a nuclear binding assay recently used to demonstrate estrogen receptors in bone [ eriksen , e.f. , colvard , d.s. , berg , n.j. , graham , m.l. , mann , k.g. , spelsberg , t.c . & riggs , b.l . ( 1988 ) science 241 , 84-86 ] was used to identify specific nuclear binding of a tritiated synthetic androgen , [ 3h ] r1881 ( methyltrienolone ) , in 21 of 25 ( 84 % ) human osteoblast-like cell strains and a concentration of bound steroid receptors of 821 +/- 140 ( mean +/- sem ) molecules per cell nucleus .
C0034804
estrogen receptors
C0034840
steroid receptors