PS: There is one here: http://www.neuroml.org/neuron_tools , but it doesn't seem to work. Header generated by this script causing synatx-error in NEURON.

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```
? This is a NEURON mod file generated from a ChannelML file
? Unit system of original ChannelML file: Physiological Units
COMMENT
ChannelML file containing a single Channel description
ENDCOMMENT
TITLE Channel: kdr
COMMENT
Delayed rectifier K channel. Comment from original mod: K-DR channel, from Klee Ficker and Heinemann,
modified to account for Dax et al., M.Migliore 1997
ENDCOMMENT
UNITS {
(mA) = (milliamp)
(mV) = (millivolt)
(S) = (siemens)
(um) = (micrometer)
(molar) = (1/liter)
(mM) = (millimolar)
(l) = (liter)
}
NEURON {
SUFFIX kdr
USEION k READ ek WRITE ik VALENCE 1 ? reversal potential of ion is read, outgoing current is written
RANGE gmax, gion
RANGE ninf, ntau
}
PARAMETER {
gmax = 0.01 (S/cm2) ? default value, should be overwritten when conductance placed on cell
}
ASSIGNED {
v (mV)
celsius (degC)
? Reversal potential of k
ek (mV)
? The outward flow of ion: k calculated by rate equations...
ik (mA/cm2)
gion (S/cm2)
ninf
ntau (ms)
}
BREAKPOINT {
SOLVE states METHOD cnexp
gion = gmax * ((1*n)^1)
ik = gion*(v - ek)
}
INITIAL {
ek = -90
rates(v)
n = ninf
}
STATE {
n
}
DERIVATIVE states {
rates(v)
n' = (ninf - n)/ntau
}
PROCEDURE rates(v(mV)) {
? Note: not all of these may be used, depending on the form of rate equations
LOCAL alpha, beta, tau, inf, gamma, zeta, temp_adj_n
TABLE ninf, ntau DEPEND celsius FROM -100 TO 100 WITH 2000
UNITSOFF
temp_adj_n = 1
? *** Adding rate equations for gate: n ***
? Found a generic form of the rate equation for alpha, using expression: (exp ( (1e-3 * -3 * (v - 13) * 9.648e4) / (8.315*(273.16 + (celsius) )) ))
alpha = (exp ( (1e-3 * -3 * (v - 13) * 9.648e4) / (8.315*(273.16 + (celsius) )) ))
? Found a generic form of the rate equation for beta, using expression: (exp ( (1e-3 * -3 * 0.7 * (v - 13) * 9.648e4) / (8.315*(273.16 + (celsius) ))) )
beta = (exp ( (1e-3 * -3 * 0.7 * (v - 13) * 9.648e4) / (8.315*(273.16 + (celsius) ))) )
? Found a generic form of the rate equation for tau, using expression: beta/(0.02 * (1 + alpha)) < 2 ? 2 : beta/(0.02 * (1 + alpha))
if (beta/(0.02 * (1 + alpha)) < 2 ) {
tau = 2
} else {
tau = beta/(0.02 * (1 + alpha))
}
ntau = tau/temp_adj_n
? Found a generic form of the rate equation for inf, using expression: 1/(1 + alpha)
inf = 1/(1 + alpha)
ninf = inf
? *** Finished rate equations for gate: n ***
}
UNITSON
```

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```
nrngui -nogui kad.mod
NEURON -- VERSION 7.4 (1316:353c7c3ecd8d) 2015-04-03
Duke, Yale, and the BlueBrain Project -- Copyright 1984-2015
See http://www.neuron.yale.edu/neuron/credits
/usr/local/nrn/x86_64/bin/nrniv: syntax error
in kad.mod near line 2
? This is a NEURON mod file generated from a ChannelML file
^
oc>
```

Dilawar