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Metaphases from a cultured cerebral germ cell tumor (CGCT) in a boy with a 46,XY constitutional karyotype had 47 chromosomes with an additional X chromosome and a translocation (1;21)(q11;p11). CGCT appear to be nonrandomly associated with Klinefelter syndrome, and a supernumerary X chromosome and trisomy of the 1q21-->1qter region may be clonal(More)
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