Synthetic chemistry. Not through the usual channels.
Echegoyen
L
L
D000595:Amino Acid Sequence; D007473:Ion Channels / Q000737:chemistry*; D008969:Molecular Sequence Data; D010456:Peptides, Cyclic / Q000737:chemistry*; D017433:Protein Structure, Secondary
D007473:Ion Channels; D010456:Peptides, Cyclic