There are multiple definitions:

1. risk allele frequency(English)

   • MAF, NRA, RA
   • Genomics

2. rapidly accelerated fibrosarcoma(English)

   • via MAPK pathway associated with human cancer initiation; also denoted as Raf
   • ERK, MAPK, MEK
   • Oncology
   • https://doi.org…emed.2021.00041
   • https://doi.org…ech.2018.09.005