TABLE 1 Summary of results

The first column gives the subunits injected. The first set of four rows gives results for receptors predicted to contain three copies of *α*4 and two copies of *β*2, while the second set gives results for two copies of *α*4 and three of *β*2. The third set of four rows shows data for receptors containing the *α*5 subunit, again ordered based on the predicted number of copies of *α*4. The final set of two rows shows data for dimeric concatemers expressed in the absence of a free subunit; the pattern of properties is distinct from a dimer expressed with a free subunit (although closest to receptors formed with a free *α*4 subunit). The second column gives the number of *α*4 subunits predicted to be in the receptor, while the third and fourth columns give the ACh EC_{50} and the response to 1 *μ*M 5I A85380 relative to the response of the same oocyte to 1 mM ACh. The fifth and sixth columns give whether the predicted receptor has adjacent *α*4 subunits and the observed effect of physostigmine. The seventh and eighth columns give the predicted number of untethered *α*4 C termini in the receptor and the observed effect of 17*β*-estradiol. The final column gives the response to 1 mM ACh. All data are mean ± S.E. (number of observations).