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Possible mechanisms of idic(Y) formation. A double-strand break occurs in the Y chromosome, and the broken ends are joined to stabilize the chromosome. This results in an idic(Y) and an acentric fragment (a). A misalignment, due to palindromic sequences in Y(p), occurs between sister chromatids followed by NAHR. Again this results in an idic(Yp) and an acentric fragment which has the length of Yp (b).
