Megacystis-Microcolon-Intestinal Hypoperistalsis Syndrome 4, is also known as mmihs4. An important gene associated with Megacystis-Microcolon-Intestinal Hypoperistalsis Syndrome 4 is MYL9 (Myosin Light Chain 9). Affiliated tissues include smooth muscle and kidney, and related phenotypes are recurrent respiratory infections and nephrolithiasis