Why does the Anti-Pyruvate Dehydrogenase E1-alpha subunit antibody give me an additional band on Western Blots?

Hi all, the Anti-Pyruvate Dehydrogenase E1-alpha subunit antibody from abcam normally running at 43kDa gives me an additional band at around 75kDa. Any ideas what this band represents? Could it be...

21 September 2015 9,932 2 View