this prediction is based upon the extensive heterogeneity of the igf-i and igf-ii ligands themselves , the multiplicity of bps which may influence igf action either positively or negatively at numerous levels , and the ability of these hormones/growth factors ( and possibly their bps ) to interact with disparate receptor moieties , both singly and in concert , in order to elicit their various effects .
C0021665
igf-i
C0037657
igf