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

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