Latisemin

Latisemin is a cysteine-rich secretory protein that can be isolated from the venom of the Black-banded sea krait, a sea snake indigenous to the warmer waters of the western Pacific Ocean.

[2] Though highly venomous, this snake is comparatively unaggressive, and is in fact caught and eaten in Erabu soup in Japan.

Latisemin has a molecular weight of 24 kDa and consists of 217 amino acids.

[1][3] It belongs to the CRISP (cysteine-rich secretory protein) glycoprotein subfamily,[4] which are single chain polypeptides containing strictly conserved cysteines[1] (cysteines not oxidised to cystine and thus not providing disulfide bond support to tertiary protein structure).

They are secretory proteins, meaning they are secreted from cells into extracellular fluid.