PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 24700787-4 2014 The hEGF, featuring three native disulfide bonds, was expressed featuring additional sulfhydryl groups, in the form of cysteine residues, as orthogonal ligation sites at both the N and C termini. Disulfides 33-42 epidermal growth factor Homo sapiens 4-8