text: Bifunctional purine biosynthesis protein PURH is a protein that in humans is encoded by the ATIC gene.
  ATIC encodes an enzyme which generates inosine monophosphate from aminoimidazole carboxamide ribonucleotide.
  It has two functions:
  *  - 5-aminoimidazole-4-carboxamide ribonucleotide formyltransferase
  *  - IMP cyclohydrolase