“…Slices were stained with antibodies specific for SOX2 (Millipore, Cat No AB5603), MAC-2 (Cedarlane Laboratories, Burlington, Canada, Cat No CL8942AP) and CD34 (Abcam, Cat No ab8158) following standard IHC protocols as described previously [ [21] , [22] , [23] ]. Details of the protocol are given in the Supplement.…”