Down Syndrome Day: Pay attention to Down Syndrome and care for "Tang Babies"
Down syndrome, also known as trisomy 21 syndrome. In 1866, British doctor Don John Langton first published this disease; In 1959, French geneticist Jerome Le Jong discovered that the disease was caused by a trisomy variation in the 21st pair of chromosomes in the human body; This is also the first disease caused by chromosomal defects discovered by humans
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