the distribution of the labeled hormones by light and electron microscopic autoradiography indicated that after exposure of pituitary cells to 125i-labeled hormones at 4 c ( 90 min ) , most of the labeled hormones were associated with the cell surface membrane , while at 37 degrees c ( 30 min ) most of the cell-bound labeled hormones were internalized .
C0699040
cell surface
C0007634
cell