MRF4 different knockout phenotypes, 2 figures

Different MRF4 null alleles had different phenotypes
Olson, E. N., H. H. Arnold, P. W. Rigby and B. J. Wold 1996. Know your neighbors: three phenotypes in null mutants of the myogenic bHLH gene MRF4. Cell. 85:1-4
Yoon, J. K., E. N. Olson, H. H. Arnold and B. J. Wold 1997. Different MRF4 knockout alleles differentially disrupt Myf-5 expression: cis-regulatory interactions at the MRF4/Myf-5 locus. Dev Biol. 188:349-362.