Antibody and isolectin labeling of retinas was performed as previously described (Stefater et al., 2011 (link)) with the following: Alexa 488-Isolectin IB4 (Life Technologies, I21411; 1:1000), Crim1 (homemade rabbit antiserum), collagen IV (rabbit; Abcam, ab19808; 1:500), BrdU (mouse; Dako, M0744; 1:100), VE-cadherin (rat; BD Biosciences, 555289; 1:100), VE-cadherin (goat; Santa Cruz, sc-6458; 1:200), CD31 (rat; BD Biosciences, 550274; 1:100), active caspase 3 (rabbit; R&D Systems, AF835; 1:100), podocalyxin (goat; R&D Systems, AF1556; 1:200), PDGFRα (goat; R&D Systems, AF1062; 1:100), desmin (rabbit; Abcam, ab15200; 1:500) and smooth muscle actin (mouse; Sigma, C6198; 1:200).