Z-band splicing in the adult heart across multiple species. A, PCR products with primers spanning Zr1 to 7 across species; B, PCR products with primers spanning Zr1 to 3, and Zr3 to 7 in human, sheep and rat heart; C, PCR products with primers spanning Zr3 to 5, and Zr4 to 6 in human, sheep and rat heart; D, Schematic diagram of splicing pattern of Z repeats based on PCR products and sequencing results across species; Zr, Z repeats; M, 1kb DNA marker; E, exon. White box, alternative exons; Grey box, exon; V, variant.