Surface model of lactate dehydrogenase (PDB ID 3LDH) showing the binding sites for NADH. Two models are provided: one for the complete homotetramer with 3 NAD's in place and one NAD binding site free; the second model is for a single homomer that was sliced in half in order to make the binding sites for NAD and pyruvic acid visible and accessible. The ligands are provided separated and can be inserted and removed. Model one can only be found in the zip archive and requires an IDEX printer for dual-color printing. Great for teaching protein/enzyme structure, as well as enzyme specificity. Made it to help me teach the biochemistry course.