In general, our results indicated, firstly, that there is no direct correspondence between mRNA levels and protein expression for some of the connexins analyzed, a fact that has also been reported for Cxs 26, 32, 37, 43 and 45 in myeloid leukemia cells [36] and Cx40 in HUVEC cells exposed to shear stress [37]. Here, GJA5 is linked to myeloid leukemia.