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5-Hydroxymethylcytosine (5hmC) is a DNA pyrimidine nitrogen base derived from cytosine. It is potentially important in epigenetics, because the hydroxymethyl group on the cytosine can possibly switch a gene on and off. It was first seen in bacteriophages in 1952. However, in 2009 it was found to be abundant in human and mouse brains, as well as in embryonic stem cells. In mammals, it can be generated by oxidation of 5-methylcytosine, a reaction mediated by TET enzymes.

Michael Charles Scott-Joynt was an English bishop and a Prelate of the Order of the Garter. He was appointed Bishop of Winchester, one of the five senior bishoprics in the Church of England, in 1995. He had previously served as Bishop of Stafford in the Diocese of Lichfield from 1987 and before that as a canon residentiary at St Albans Cathedral. On 10 October 2010, it was announced that Scott-Joynt intended to retire, which he did in May 2011.

STS-37, the thirty-ninth NASA Space Shuttle mission and the eighth flight of the Space Shuttle Atlantis, was a six-day mission with the primary objective of launching the Compton Gamma Ray Observatory (CGRO), the second of the Great Observatories program which included the visible-spectrum Hubble Space Telescope (HST), the Chandra X-ray Observatory (CXO) and the infrared Spitzer Space Telescope. The mission also featured two spacewalks, the first since 1985.