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Nhlamuselo ya le hansi

b Vito ra vuvabyi lebyi ri te na John Langdon Down, dokodela wa Munghezi la nyikeleke nhlamuselo ya byona hi 1866. Hi 1959, Jérôme Lejeune wa le Furwa la nga mutivi wa switekela u xiye leswaku vana lava nga ni vuvabyi lebyi va velekiwa va ri ni chromosome leyi engetelekeke eka tisele ta vona, ematshan’weni yo velekiwa va ri na 46, va velekiwa va ri na 47 wa tona. Kambe hi ku famba ka nkarhi, valavisisi va xiye leswaku eka chromosome 21 ku va ku engeteleke yin’wana.

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