GAPDH and Hepatitis: We used human Jurkat T cells to analyze the interaction of NTM with importins alpha and beta because T lymphocytes are involved in hepatitis and vascular inflammation and our initial study of nuclear transport mediated by importin alpha was performed in these cells.5 As documented in Figure 4A, the full‐length biotinylated NTMs (SN50 and cSN50.1) interacted with importins alpha 1, 4, and 5 but not with the nonspecific cytoplasmic control protein GAPDH.