;; Cerebellar Purkinje Cell: resurgent Na current and high frequency
;; firing (Khaliq et al 2003).

(nemo-model K2

  ((input v 
	  (cai from ion-pools)
	  (ica from ion-currents))

   (const ena = 60)
   (const ek = -88)
   (const ca0 = 1e-4)

   (component (type gate-complex) (name K2)
   ;; HH Low TEA-sensitive Purkinje potassium current

	      (component (type gate)

			 ;; constants

			 ;; rate functions

			 (K2_v = (v + 11)) ;; account for junction potential

			 (K2_minf = 
  		           (let ((mivh -24)
				 (mik  20.4))
			     (1 / (1 + exp ((neg(K2_v - mivh)) / mik)))))


			 (K2_mtau =
			     ((1e3) * (if (K2_v < -20) 
					  then (0.000688 + 1 / (exp ((K2_v + 64.2) / 6.5) + exp ((K2_v - 141.5) / -34.8)))
					  else (0.00016 + 0.0008 * exp (-0.0267 * K2_v)))))

			 
			 (hh-ionic-gate 
			  (K2  ;; ion name: exported variables will be of the form {ion}_{id}
			   (initial-m  (K2_minf))
			   (m-power    4)
			   (h-power    0)
			   (m-inf      (K2_minf))
			   (m-tau      (K2_mtau))))
			 
			 )
	      
	      (component (type pore)
			 (const  gbar_K2  = 0.002)
			 (output gbar_K2 ))
	      
	      (component (type permeating-ion) (name k)
			 (const e_K2 = ek)
			 (output e_K2 ))
	      
	      ) ;; end K2 current


))