Save a generous 15% when you purchase all three Virtmac Kits together in the Virtmac Collection. This collection includes Kit 1- Membrane Protein Kit; Kit 2- DNA/RNA Protein Kit, and Kit 3- Protein Folding/Enzyme Structure Function Kit. Each kit includes a DVD with easy to follow instructions and video lessons. GO TO: www.virtmac.com to view video teaching clips and teacher and student testimonials.