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These functional isoforms differ in their translation start site, resulting in length variations, with isoform A consisting of 222 amino acids and isoform X1 containing 264 amino acids, including an additional 42 amino acid segment at the N-terminus
J Clin Invest 2013
Because research-grade material is of unverified identity and purity, identity confirmation (for example by mass spectrometry and HPLC) is the kind of characterization a rigorous research setting would require before drawing any conclusion
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