1DHR:
reference: Crystal structure of rat liver dihydropteridine reductase., Varughese KI, Skinner MM, Whiteley JM, Matthews DA, Xuong NH, Proc Natl Acad Sci U S A 1992 Jul 1;89(13):6080-4. PMID: 1631094

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).