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Thank you! Your advice and suggestions worked perfectly!

Thanks here is a copy of the NEURON Block and error messages NEURON { SUFFIX GrC_pNa USEION na READ ena WRITE ina RANGE gnabar, ina, g, alpha_m, beta_m RANGE Aalpha_m, Kalpha_m, V0alpha_m RANGE Abeta_m, Kbeta_m, V0beta_m RANGE V0_minf, B_minf RANGE m_inf, tau_m } And here a copy of the error message...

Hey Everyone! Thanks for taking the time to try and help me out. I am new to NEURON and so this question is probably really simple to answer. I have recently added a procedure to a mod file which I placed below PROCEDURE block_pna(A) { LOCAL block_fraction block_fraction = A gnabar = block_fraction ...