An endothelial cell which is part of the afferent arteriole in the kidney. This cell is responsible for maintaining renal blood flow and glomerular filtration rate. [ http://www.ncbi.nlm.nih.gov/pubmed/22733355 http://www.ncbi.nlm.nih.gov/pubmed/16990493 http://www.ncbi.nlm.nih.gov/pubmed/25834230 http://www.ncbi.nlm.nih.gov/pubmed/24066938 ]