frameshift mutation / frame-shift mutation; frameshift. A frameshift mutation is a genetic mutation caused by a deletion or insertion in a DNA sequence that shifts the way the sequence is read. A DNA sequence is a chain of many smaller molecules called nucleotides.
As for Flexeril (cyclobenzaprine) is is not a controlled substance under US, Canadian, or international law. Some drugs used as muscle relaxants ARE controlled substances like Valium and many US states and countries have listed Soma (carisoprodol) as a controlled substance (or prohibited it).
4. Cyclobenzaprine (Flexeril). Description. Flexeril is a muscle relaxer that is prescribed to manage spasms, stiffness and pain. How to take. This medication should be consumed with a glass of water and it can be taken with food if it causes an upset stomach. Take doses at regular intervals.