Relative length of Xist elements.

Notes. Pseudoexon (pEx) means a part of an intronic sequence which is present in other species as an exon. Abbreviations: exons (Ex) and pseudoexons (pEx), in Canis familiaris (C.f.), Bos taurus (B.t.), Homo sapiens (H.s.), Pan troglodytes (P.t.), Rattus norvegicus (R.n.), Mus musculus (M.m.), Microtus rossiaemeridionalis (M.r.), and consensus Xist gene; (�C) the exon is missing. Length is shown in base pairs.