There are multiple definitions:

1. frequency response function(English)

   • EMG, IEMG
   • Electrophysiology, Signal analysis

2. fasting-reduced factor(English)

   • dietary intervention as a promising adjunct for cancer therapy
   • AKT, BC, ER, ET, FMD, mTOR, PI3K, PTEN
   • Diet, Oncology, Mammary gland
   • https://doi.org…392-020-00271-y