[1] R. Bowen, “Vitamin K,” Colorado State University, 1999. http://www.vivo.colostate.edu/hbooks/pathphys/misc_topics/vitamink.html
[2] J. Higdon, “Vitamin K,” Linus Pauling Institute at Oregon State University, 2004. http://lpi.oregonstate.edu/infocenter/vitamins/vitaminK/
[3] B. I. Carr, Z. Wang and S. Kar, “K Vitamins, PTP Antagonism, and Cell Growth Arrest,” Journal of Cellular Physiology, Vol. 193, No. 3, 2002, pp. 263-274. doi:10.1002/jcp.10171
[4] N. Runzhou, Y. Nishikawa and B. I. Carr, “Cell Growth Inhibition by a Novel Vitamin K Is Associated with Induction of Protein Tyrosine Phosphorylation,” The Journal of Biological Chemistry, Vol. 273, 1997, pp. 9906-9911.
[5] Sigma-Aldrich. “U937 Cell Line Human,” 2010. http://www.sigmaaldrich.com/catalog/ProductDetail.do?D7=0&N5=SEARCH_CONCAT_PNO%7CBRAND_KEY&N4=85011440%7CSIGMA&N25=0&QS=ON&F=SPEC
[6] T. Nishiguchi, T. Kobayashi and M. Sugimura, “Upregulation of Thrombomodulin Antigen Levels in U937 Cells by Combined Stimulation with Estradiol-17beta and Vitamin K2 (Menaquinone 4),” Journal of Cellular Physiology, Vol. 25, 1999, pp. 509-517.