Only the long ycf2 gene showed a highly significant increase in selection intensity associated with the evolution of obligate parasitism.
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The sentences
Previous analyses of selection patterns in Cuscuta and Corallorhiza have found relaxation of selective pressure on photosynthesis genes, although relaxation may not be significant in Cuscuta ( McNeal et al. 2007 ; Krause 2010 , 2011 ; Barrett et al. 2014 ).