igf-i binds rapidly and reversibly to im-9 cells at 15 degrees c , with half-maximal displacement of 125i-i-igf-i at igf-i concentrations of 3.6 x 10 ( -9 ) m and insulin concentrations of 5 x 10 ( -7 ) m .
C0021665
i-igf
C0037657
igf