Aims.UltraCompact Hii regions are signposts of high-mass star formation. Since high-mass star formation occurs in clusters, one expects to find even earlier phases of massive star formation in the vicinity of UltraCompact Hii regions. Here, we study the amount of deuteration and depletion toward pre/protocluster clumps found in a wide-field (1010 arcmin) census of clouds in 32 massive star-forming regions that are known to harbour UCHii regions.
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Pillai et al. (2007) studied this question.
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