Ras

Ras (in molecular biology) are very important molecular switches for a wide variety of signal pathways that control such processes as cytoskeletal integrity, proliferation, cell adhesion, apoptosis, and cell migration. Ras and ras related proteins, are often deregulated in cancers, leading to various effects, that leads to increased invasion and metastasis, and decreased apoptosis.

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RAS is also an abbreviation for the Russian Academy of Science
"Ras" is also a record label for recorded music, especially Reggae.