Figure 3E. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S0925-4773(99)00182-3] Mech Dev 88: 237-41, Brunskill EW; Witte DP; Shreiner AB; Potter SS, Characterization of npas3, a novel basic helix-loop-helix PAS gene expressed in the developing mouse nervous system. Copyright 1999.