CSNK1A1 and melanoma: In order to evaluate a further putative function of the CK1 isoforms in tumorigenesis - an increase in the migratory behavior of the tumor cells - we induced the expression of CK1α, δ and ε isoforms in SKMEL19 melanoma cells by doxycycline treatment and measured the migratory potential of the cells over time using the XCelligence system.