<iframe width="580" height="385" src="https://www.youtube.com/embed/u5QUKWCDqtg?autoplay=1" frameborder="0" allowfullscreen></iframe> <br>nitricoxide #ED #treatment #drkumareducationclinic Nitric oxide is synthesized by NOS-dependent and -independent pathways. <br><a href="https://www.youtube.com/watch?v=u5QUKWCDqtg">source</a>