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Hematoxylin and eosine staining in glioblastoma stem cells (GSC 528 (a) and GSC 157 (b) tumors at day 19 of embryonic development. CE: chorionic epithelium, AE: allantoic epithelium, M: intermediate vascularized mesenchyme, BV: blood vessel, and T: tumor. TGM2 (c: GSC 528; d: GSC 157) and SOX2 (e: GSC 528; f: GSC 157) protein expression in tumor cells; TGM2-positive staining is in red (c). Scale bars are 1 (a,b) and 0.1 mm (c–f).
