HLH54FS0323 habors a deletion of the entire HLH54F coding region and flanking regions (breakpoints undefined as yet).
HLH54FΔ598/HLH54FS0323 is rescued by HLH54F+t4.5
The presence of one copy of HLH54F+t4.5 is enough to rescue the semi-lethality and loss of caudal visceral mesoderm found in HLH54FΔ598/HLH54FS0323 mutants.