Ice nucleation proteins enable bacteria to nucleate crystallization in supercooled water. Contains 122 imperfect repeats of a consensus octapeptide A-G-Y-G-S-T-L-T; further on a 16-residue and a regional 48-residue periodicity is superimposed. Used by snowmaking industry to promote ice nucleation for artificial snow and economize water. Sold under the name Snomax by York. A structural model is suggested in which the ice nucleation protein displays a symmetry related to that of ice. Belongs to the bacterial ice nucleation protein family.