- The -700/-310 fragment of the apolipoprotein A-IV gene combined with the -890/-500 apolipoprotein C-III enhancer is sufficient to direct a pattern of gene expression similar to that for the endogenous apolipoprotein A-IV gene. Le Beyec, J., Chauffeton, V., Kan, H.Y., Janvier, P.L., Cywiner-Golenzer, C., Chatelet, F.P., Kalopissis, A.D., Zannis, V., Chambaz, J., Pinçon-Raymond, M., Cardot, P. J. Biol. Chem. (1999)