Figure 1B. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S0925-4773(98)00180-4] Mech Dev 79: 131-5, Mariani M; Corradi A; Baldessari D; Malgaretti N; Pozzoli O; Fesce R; Martinez S; Boncinelli E; Consalez GG, Mab21, the mouse homolog of a C. elegans cell-fate specification gene, participates in cerebellar, midbrain and eye development. Copyright 1998.