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As it happens, we have been having some issues with batch-to-batch
variation with an antibody against CBX7 (AB21873) that we use extensively
for chromatin immunoprecipitation (ChIP). Lot # 937204 worked very well
whereas Lot #937205 did not. We did manage to get what we believe may
have been the last aliquots of the good batch but are just about to run
out. If there have been any more recent batches, we would be very keen to
try some before restocking.
Asked on Feb 23 2012
Thank you for your enquiry. I am sorry to hear of the trouble you are having with lot 937205 in ChIP. I looked in our records and there was one other complaint of a similar nature regarding ChIP with this lot of ab21873. We do have a new lot in stock now (lot GR21097-1) and I am happy to offer a replacement for the faulty vial of ab21873.
Please pass along the PO number or Abcam order reference number associated with the purchase of ab21873, lot 937205 so I can process the replacement.
Answered on Feb 23 2012