Immunohistochemistry and 5-bromo-4-chloro-3-indoyl-D-galactopyranoside (X-gal) staining were performed as previously described [20 (link), 41 ]. Tissues were sliced into to 12 or 20 μm thick sections. The following primary antibodies were used to perform immunofluorescence labeling: mouse anti-CRE (Millipore, 69050-3), rabbit anti-EBF1 (Merck, AB10523), rabbit anti-ISL1 (Abcam, ab20670), chicken anti-GFP (AVES Labs, GFP-1020), rat anti-BCL11B (Abcam, ab18465), rabbit anti-FOXP1 (Abcam, ab16645) and rabbit anti-SP9 (1:500) [20 (link)]. Alexa Fluor 488-, Cy3- or 647-conjugated secondary antibodies were purchased from Jackson ImmunoResearch.
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