Mutants for Hoxb1 have outflow tract defects.
FGF/ERK and BMP/SMAD signaling are deregulated in Hoxb1 mutant embryos.
Premature differentiation of second heart field progenitors in the pharyngeal mesoderm of Hoxb1 deficient embryos.
Redundant roles of Hoxa1 and Hoxb1 during outflow tract development.