Multimers of a single oligonucleotide from the B fragment (B207) activate pharyngeal expression in a pattern very similar to that observed with the duplicated B fragment, with expression predominately in pharyngeal muscles
m3,
m4,
m5 and
m7. Unlike the larger B fragment, the B207 oligonucleotide occasionally activates additional expression in cells other than pharyngeal muscle (e.g. pharyngeal marginal cells, body wall musculature and intestine).