to obtain information about the functional significance of the structural heterogeneity that has been described for rat insulin-like growth factor i ( igf-i ) cdnas , we hybridized polyadenylated rnas from rat tissues at different developmental stages with probes specific for two variant 5'-sequences ( designated here as type 1 and type 2 ) , with a probe specific for ib type e domain coding sequences and with a probe for e domain sequences common to ia and ib type igf-i cdnas .
C0021665
igf-i
C0037657
igf