Sequence alignment of bHLH domain of CeABF-1 with the class II family of bHLH proteins. Multiple sequence alignment of the bHLH region of nematode ABF-1 (a.) with the most related class II bHLH proteins as determined by the Clustal algorithm. Interestingly, CeABF-1, human ABF-1 (7), MyoR (10) and capsulin (11), all contain the two conserved amino acids, SK, near the more N-terminal side (see asterisks).