mutant embryos display an approximately twofold excess of cardioblasts along the whole anterior-posterior axis of the dorsal vessel, although the phenotype is more prominent in the posterior segments. Double-labellings for svp
, and lbe
show that all types of cardioblasts in an abdominal hemisegment are increased in number, although to different extent.
embryos display muscle contraction but fail to hatch and die approximately 2 days after egg deposition.