The two directories CAT_MN_S-type and Rat_MN_F-type contain code from our MN model files built with GENESIS. Considering that the kernel part of the models is the definition of the active conductances, I supplied the programs for the all active conductances with a file for the definition of variables used in the models. As an example of how to use this code I supplied one of our models for public distribution five years ago in the SCM_Cat_dist folder. A brief manual in a word (or openoffice) file describing usage of the model is also attached. Please note that this model is not exactly the same as the one published in J Physiol 544: 521-536, 2002. For examples, the persistent sodium conductance (gNaP) was not included in the model, and the more active conductances could be activated in axon and dendrite compartments in this model. But it's a good tool for those who are interested in learning and using the single cell model in their studies. ... Since there is only small modifications in the codes for the definition of cell types (S, FF, & FR for cat MNs and S & F for rat MNs), I selected an S-type of cat and a F-type of rat MNs. The cat MN model was published in Dai Y, Jones KE, Fedirchuk B, McCrea DA, Jordan LM (2002) A modelling study of locomotion-induced hyperpolarization of voltage threshold in cat lumbar motoneurones. J Physiol 544:521-36 and the rat MN model is published in Gardiner P, Dai Y, Heckman CJ (2006) The effects of exercise training on alpha-motoneurones J Appl Physiol 10.1152/japplphysiol.00482.2006 -------------------------------------------- Yue Dai, PhD Spinal Cord Research Center (SCRC) Physiology Department University of Manitoba Winnipeg, MB R3E 3J7 Canada Email: ydai@scrc.umanitoba.ca