B2M and glioblastoma: The study used a primary culture of GBM7-Luc2-mKate2 human glioblastoma, a line of YT (YTwt) wildtype human NK cells, as well as lines created by us with overexpression of VAV1 protein with either CISH (YT–Vav1+CISH–/–) or B2M (YT–Vav1+B2M–/–) knockouts.