Cover design The front cover of Human Reproduction shows the results of fluorescence in-situ hybridization analyses of a Klinefelter syndrome patientŐs spermatozoa and spare preimplantation embryos using DNA probes specific for chromosomes X (green) Y (red) and 18 (aqua). An abnormal sperm nucleus XY18 is shown (top left) along with abnormal nuclei from one chaotic embryo: XXYY1818 (top right), X1818 (bottom left), Y18 (bottom right). The frequency of sex chromosome hyperploidy in the spermatozoa of the Klinefelter patient was higher than normal. Only 3 out of the 10 spare embryos were normal for the chromosomes tested. For further details, see pp. 440444.
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