jan 1, 1999 - 1999 - First human chromosome is decoded

Description:

In 1999, an international team of researchers reached a major milestone when they unravelled for the first time the full genetic code of a human chromosome. The chromosome in question was chromosome 22, which contained 33.5 million "letters," or chemical components.

At the time, the sequence was the longest continuous stretch of DNA ever deciphered and assembled. However, it was only the first deciphered chapter of the human genetic instruction book - the rest was still to come.

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