slp1 sequences from 8.7 to 7.2kb upstream of the slp1 promoter, followed by a segment that extends from 72bp upstream to 57bp downstream of the slp1 transcription start site is fused upstream of a lacZ reporter.
The slp1 reporter recapitulates the slp1 expression pattern at the gastrula stage, although the odd-numbered stripes are somewhat stronger.