The exon : intron structure of chicken IL2 corresponds almost exactly to those of mammalian IL2s with the exceptions of exon 2 and introns 2 and 3 which are shorter .
the exon : intron structure of chicken il2 corresponds almost exactly to those of mammalian il2s with the exceptions of exon 2 and introns 2 and 3 which are shorter .
O B-DNA_substructure I-DNA_substructure I-DNA_substructure I-DNA_substructure O B-protein_molecule B-protein_molecule O O O O O O O B-protein_molecule O O O O B-DNA_domain_or_region I-DNA_domain_or_region O B-DNA_family_or_group O O O O O O O