TABLE 1.

Macroscopic, single channel conductances (γ_j), and calculated channel numbers for each homotypic and heterotypic connexin combination tested in Xenopus oocyte pairs

Cx	gobserved (μS)*	γj (pS)	gcorrected (μS)†	No. of channels (×105)‡
mCx45	4.05	32§¶	4.27	1.3
rCx32	45.2	55‖**	107	20.0
rCx43	48.8	90††	130	14.8
rCx26	42.6	135‖**	94	7.1
mCx40	54.9	198‡‡	185	9.5
mCx37	31.7	315§§	53	2.3
Cx26/Cx32	44.8	90‖**	105	12.8
Cx37/Cx43	35.8	140¶¶	66	5.6

^*g_observed equals the conductance calculated from the voltage difference between the electrodes, and compensation current in the voltage clamp of the cell where the membrane potential is held constant.

^†g_corrected equals the junctional conductance corrected for cytoplasmic access resistance as estimated in Fig. 5.

^‡N = g_corrected/γ_j.

^§Moreno et al. (1995).

^¶Veenstra et al. (1994b).

^‖Bukauskas et al. (1995a).

^**Suchyna et al. (1999).

^††Veenstra et al. (1995).

^‡‡Bukauskas et al. (1995b).

^§§Traub et al. (1998).

^¶¶Cx43/Cx37 single channel conductances were obtained by the sum of the respective homotypic hemichannel resistances estimated from Traub et al. (1998), Veenstra et al. (1995), and Moreno et al. (1994).