One logical outgrowth of the quest to control cell state as a part of regenerative medicine is an initiative to control the state of cancerous cells. From EurekAlert!: researchers "discovered that aggressive melanoma cells (but not normal skin cells nor less aggressive melanoma cells) contain specific proteins similar to those found in embryonic stem cells. This groundbreaking work led to the first molecular classification of malignant melanoma and may help to explain how, by becoming more like unspecialized stem cells, the aggressive melanoma cell gained enhanced abilities to migrate, invade and metastasize while virtually undetected by the immune system. ... Embryonic stem cells are pluripotent, meaning they are able to differentiate into any of the more than 200 cell types in the adult body. Which type of cell they become depends on the signals they receive from their microenvironment. Similarly, during cancer progression, malignant cells receive and release signals from their own microenvironment, cues that promote tumor growth and metastasis. ... scientists can change human metastatic melanoma cells back to normal-like skin cells - by exposing the tumor cells to the embryonic microenvironment of human embryonic stem cells."