Figure 2A. Copyright: Reprinted with permission from Elsevier from [doi:10.1016/S0925-4773(99)00234-8] Mech Dev 90: 3-15, Hidaka M; Caruana G; Stanford WL; Sam M; Correll PH; Bernstein A, Gene trapping of two novel genes, Hzf and Hhl, expressed in hematopoietic cells. Copyright 2000.