epidermal growth factor (egf) signaling protein molecule. 3d rendering. cartoon representation with secondary structure coloring (

pdb2kv4 epidermal growth factor egf cell egfr receptor residue cancer tumor targeted gefitinib erlotinib afatinib osimertinib cetuximab colon lung inhibitor icotinib panitumumab brigatinib lapatinib structure peptide protein 3d rendering amino acid molecule polypeptide polymer atoms science scientific disease health molecular model