Comparisons of tandem repeat sequence in humans, sheep, goat, cattle and chicken. Tandem repeat sequences were obtained from GenBank at the National Center for Biotechnology Information (NCBI), including those of human (Homo sapiens, BAG32277.1), sheep (Ovis aries, NP_001009481.1), goat (Capra hircus, NP_001301176.1), cattle (Bos taurus, NP_001258555.1) and chicken (Gallus gallus, in this study). Arrows indicate the hexapeptide deletion polymorphism found in this study. Hexapeptide repeat units were named from U1 to U7 in turn. Word spacing and underlines discriminate consecutive tandem repeat units.