Myself, along with colleagues Hannah DeBerg, Stefan Stoll, William Zagotta, Peter Brzovic and Joel Rosenbaum have published a paper on an accessory protein of HCN channels called TRIP8b.

http://www.cell.com/structure/abstract/S0969-2126(15)00053-2?_returnURL=http%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0969212615000532%3Fshowall%3Dtrue