Reporter constructs. The constructs are shown below the gene diagram to indicate their relative positions on the gene. The 5' and 3' flanks are lines and exons and reporters are boxes. The solid green box represents the EGFP-F and the cross-hatched green box the GFP reporter. The yellow bar in exon 1c represents HCS1 and the light green bar in exon 1a HCS2. The white arrows indicate HindIII sites.