Fast a-type potassium kv4 channel for gpe neuron, modeled by gunay et al. (2008), implemented in neuron by kitano, 2011. No model db ancestors. Originally, the kinetics were fit to data in tkatch et al. (2000) (info from gunay paper). The fast and slow ka channels here have the same activation kinetics, but different inactivation kinetics. Modeling study based on a previous paper, with experiments and multicompartmental modeling (gunay et al. 2008). Animal model comes from this previous paper.