Probable ion channel inhibitor. Expressed by the venom gland. The presence of a 'disulfide through disulfide knot' structurally defines this protein as a knottin. Monoisotopic mass. Several genes are coding for U1-theraphotoxin-Cg1a for which the structure by NMR has been determined. The cross-references to PDB can be found in entry JZT7A_CHIJI (AC P0C2X7). Belongs to the neurotoxin 10 (Hwtx-1) family. 46 (Jztx-7/10/12) subfamily.