Image: Number of D-lysine Hydrobromide Repeating Units * x=20 (poly-D-lysine hydrobromide, MW=4,200 Da) x=50 (poly-D-lysine hydrobromide, MW=10,000 Da) Pack Size * 100 mg, $180.00 500 mg, $720.00 1 g, $1,150.00 Description of Poly-D-lysine Hydrobromide: