DRG neurons were cultured in DRG culture medium with the secretome from Aldh1a1−/− adipocytes (1/1, v/v) that were treated with or without RA (100nM). RA was added to Aldh1a1−/− differentiation medium (Day 0, 2, 5). To prepare this secretome, medium was collected for the last 24 hours. (A) Representative images were selected from 3 independent experiments. (B) Mean neurite growth indices were measured by XTI microscopy in DRG neurons in DRG culture medium containing Veh (vehicle, white bar), NGF (vertical lined bar), or Aldh1a1−/− secretome treated without (black bar) or with RA (hatched bar). An asterisk indicates P<0.05; Mann-Whitney U test.