sm-c/igf-i ( 15 ng/ml ; 2 nm ) , msa/rigf-ii ( 50 ng/ml ; 7 nm ) , insulin ( 10,000 ng/ml ; 1750 nm ) or proinsulin ( 16,000 ng/ml ; 1750 nm ) , however , cause these cells to increase threefold in number during four days of incubation .
C0021641
insulin
C0033362
proinsulin