There are multiple definitions:

1. cholecystokinin(English)

   • Abbreviation may be used in Am. Soc. Physiol. journals without definition.
   • CCK-2R
   • Physiology

2. cell counting kit(English)

   • ATCC, EC, NANOG, OCT4, PTCH1, RIP, WR
   • Cell biology, Transcription
   • https://doi.org…cell.00136.2023