When there are too many genes in an operon, the gene regulation diagram looks ugly. ex: <img width="363" alt="screen shot 2015-12-17 at 1 41 33 pm" src="https://cloud.githubusercontent.com/assets/1227083/11878441/e8a0345c-a4c3-11e5-9dbc-128969cafdc3.png">
When there are too many genes in an operon, the gene regulation diagram looks ugly.
ex: