BAG1 and cyst: Interestingly, differentially abundant proteins were clearly linked to phenotypic changes associated to in vitro adaptation: loss of ability to spontaneously form cysts at high passages and decreased expression of cyst and bradyzoite markers (BAG1, Enolase 1, and SRS35A), while culture adaptation was associated with increased abundance of recognized virulence factors such as GRA15, GRA16, TEEGR and NSM.