There are multiple definitions:

1. B-lymphocyte chemoattractant(English)

   • CXCR5, FDC
   • Immunology

2. ball leg curl(English)

   • a type of eccentric hamstring exercise
   • BF, NHE, EMG, SLDL, SM, ST, USLDL
   • Exercise & Training, Myocyte / muscle, Electrophysiology
   • https://doi.org…941738120938649