Left, asterisks indicate verified (sequenced) products detected in at least 3/5 animals in diaphragm (DIA; red), extensor digitorum longus (EDL; blue), or soleus (SOL; green). “?” indicates primer pairs that were not attempted in muscle. Far right, X indicates verified products detected in P14 hippocampus extract. “-“ on both sides indicates products that were never detected in at least five independent experiments.