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Central pattern generators (CPGs) are neural circuits that create rhythmic activity of movements like locomotion

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Central pattern generators (CPGs) are neural circuits that create rhythmic activity of movements like locomotion. Answer the following questions:

A) Where are CPGs for locomotion located in the nervous system? 

B) Some CPG neurons express a Ca2+-dependent K+ channel that contributes to the generation of the rhythm. Imagine these neurons now express a mutant version of the Ca2+-dependent K+ channel that is not sensitive anymore to Ca2+. How would this change the rhythm of the CPG if at all? Explain your answer 

C) Describe a network mechanism that could allow CPGs to create rhythmic activity