embryonic chick pelvic cartilages were incubated in the presence of insulin like growth factor ( igf ) ( 1 - 100 microunits/ml ) , as well as normal human serum ( 5 % ) , with radiolabelled precursors of proteoglycan ( pg ) synthesis : l- [ 3-3h ] serine , d- [ 6-3h ] glucosamine and [ 35s ] na2so4 .
C0037657
insulin like
C0021665
igf