https://pmc.ncbi.nlm.nih.gov/articles/PMC51538/
DL-2-amino-4-phosphonobutyric acid does not eliminate "ON" responses in the visual system of...
DL-2-Amino-4-phosphonobutyric acid (APB) suppresses activity in retinal ON pathways. It is generally assumed that loss of the ON pathway would result in loss...