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Daddy's brood.(THE NATURAL MOMENT)
May 1, 2009... [ILLUSTRATION OMITTED]
Erratum.(WORD EXCHANGE)(Correction notice)
May 1, 2009... In "You Can't Hide, Glycolaldehyde" ["Samplings," 3/09], ribose was called "the backbone of RNA." In fact, ribose molecules and phosphate groups form that backbone.