CD44 and focal segmental glomerulosclerosis: Eng and colleagues showed that a subset of PECs on the glomerular tuft co-express the activation marker CD44 in a mouse model of FSGS, and that these activated PECs migrate from Bowman’s capsule to the glomerular tuft to become podocyte progenitors, as this regeneration contributes to an increase in the number of podocytes, which is accompanied by decreased scarring (Eng et al., 2015).