Just curious if anyone else has run into this and has some insight. Ortho Gel 0.8% Screening Cells, 3 cell screen. VSS548 Expires 6/25/13. Lot in use as of 5/28/13. We've had half a dozen positive antibody screens that were positive in the 2 cell, w+ through 2+, where the panel was either negative or identified antibodies to low frequency antigens (Cw and Kpa). The first one occurred the day the lot was used. Thanks !