or
Low endotoxin, Preservative- and carrier-free, Source: E. coli, 50ug, Lyophilized, 10mM Tris, M.W.: 18.5kDa (based on a.a. sequence), Purity: >98% by SDS-PAGE and HPLC analysis, <1 EU/microgram, 2 x 107 units/mg