Fig1F. Copyright: Reprinted with permission from Elsevier from [doi:10.1006/dbio.2000.9753] Dev Biol 223: 266-78, Christoffels VM; Habets PE; Franco D; Campione M; de Jong F; Lamers WH; Bao ZZ; Palmer S; Biben C; Harvey RP; Moorman AF, Chamber formation and morphogenesis in the developing mammalian heart [published erratum appears in Dev Biol 2000 Sep 1;225(1):266] Copyright 2000