Pros

{
  "id": "MLC-T-CHM-009559",
  "term": "Pros",
  "field": "Chemistry",
  "definition": "A locant for the imidazole ring of histidine, from the Greek for near, marking the ring nitrogen atom closest to the side chain and abbreviated with the Greek letter pi. The nitrogen atom farther from the side chain is the tele position, abbreviated with tau. The pair settles a clash between two numbering schemes, since biochemists numbered the near nitrogen 1 while organic chemists numbered it 3.",
  "subject": "Chemistry and Human Health",
  "see_also": [
    "branch"
  ],
  "references": [
    "White Book, 2nd ed., p. 43 (https://iupac.qmul.ac.uk/bibliog/white.html)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/pros/"
}