EBIProteins Get Molecule Processing

Get molecule processing features for a protein from the EBI Proteins API. Returns signal peptides, transit peptides, mature protein chains, propeptides, and initiator methionine annotations. Essential for understanding how a protein precursor is processed into its functional form. Example: P01308 (Insulin) returns signal peptide (1-24), B chain (25-54), C peptide (57-87), and A chain (90-110) showing the complete insulin processing pathway.