Medicago AB Products Are Available Worldwide. For Research Use Only. Galanthus Nivalis Lectin (GNA) is isolated from snowdrop bulbs and has a molecular weight of 52 kDa. The lectin contains little or no carbohydrate and does not need Ca2+ or Mn2+ for binding, since unlike most mannose-specific lectins it is not a metalloprotein. Structures containing (α-1,3) mannose residues are preferred for binding. Unlike the majority of mannose-binding lectins, GNA does not bind alpha-linked glucose. GNA is supplied without preservatives as a lyophilized powder. Larger quantities are available on request. For laboratory use only.