Encystation commitment in Giardia duodenalis: a long and winding road R. Argüello-Garciá, M.L. Bazán-Tejeda and G. Ortega-Pierres Parasite, 16 4 (2009) 247-258 Published online: 15 December 2009 DOI: 10.1051/parasite/2009164247