- Expression level of MDR1 message in peripheral blood leukocytes from healthy adults: a competitive nucleic acid sequence-based amplification assay for its determination. Kobayashi, H., Takemura, Y., Hayashi, T., Ujiiye, T., Kawase, M., Niino, Y., Miyachi, H., Ohshima, T., Hotta, T. Clin. Chem. Lab. Med. (2004)