Zietchick Research Institute 1 article published in JoVE Biology Demonstrating a Linear Relationship Between Vascular Endothelial Growth Factor and Luteinizing Hormone in Kidney Cortex Extracts Arivalagan Muthusamy1, Adhavan Arivalagan1, Tammy Z. Movsas1 1Zietchick Research Institute Presented here is a protocol for utilizing a cortical kidney extract preparation and total protein normalization to demonstrate the correlation between vascular endothelial growth factor and luteinizing hormone in the mammalian kidney.