Chemical evolution in the early phases of massive star formation - II. Deuteration T. Gerner, Y. L. Shirley, H. Beuther, D. Semenov, H. Linz, T. Albertsson and Th. Henning A&A, 579 (2015) A80 Published online: 01 July 2015 DOI: 10.1051/0004-6361/201423989