| http://www.w3.org/ns/prov#value | - It is still unclear whether studies on morphogen pathways performed in cultured melanoma cell lines provide an accurate reflection of their function in the microenvironment of a human tumor, where factors such as hypoxia, angiogenesis, tumor stroma and immune surveillance play significant roles during melanomagenesis, but cannot be easily replicated in the cell culture environment of a plastic dis
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