Who reported that Down's syndrome is due to extra \( 21 \mathrm{st} \) chromosome? (a) JL Down (...
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Who reported that Down's syndrome is due to extra \( 21 \mathrm{st} \) chromosome?
(a) JL Down (1866)
(b) Lejeune (1959)
(c) Klinefelter (1942)
(d) Huntington (1872)
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