[1] Duke Univ, Sch Med, Dept Physiol, Durham, NC USA
[2] Duke Univ, Sch Med, Dept Pharmacol, Durham, NC USA
[3] Duke Univ, Sch Med, Dept Biochem, Durham, NC USA
[4] Duke Univ, Sch Med, Dept Physiol, Durham, NC USA
[5] Duke Univ, Sch Med, Dept Pharmacol, Durham, NC USA
[6] Duke Univ, Sch Med, Dept Biochem, Durham, NC USA