The transgene, which encodes a fusion protein between GFP and CATSPER1, inserted randomly into the genome. The construct contains a hemagglutinin epitope-tagged EGFP without a stop codon placed into a genomic fragment immediately 5' of the Catsper1 translation start site. Sequences in the 4 kb interval of exon 1 of the construct 5' drive transgene expression. (J:123481)