TNFRSF12A and kidney disorder: Fn14 was previously detected in serum and urine of a mouse model of the kidney disease nephrotoxic nephritis and in serum of human healthy volunteers (Sharif et al, 2016; Chen et al, 2018, 2019), but it remained unclear whether this form of Fn14 corresponds to the proteolytically generated sFn14 or instead represents full‐length Fn14, potentially released from multivesicular bodies or dead cells.