Flocculation, in the field of chemistry, is a process wherein colloids come out of suspension in the form of floc or flake; either spontaneously or due to the addition of a clarifying agent.
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Interleukin-2 is the only drug approved in the US for the treatment of metastatic RCC. It is also approved in many other countries. But IL-2 isn't just a drug. IL-2 is a natural part of your immune system, a messenger protein called a cytokine which activates parts of your immune system. IL-2 does not kill tumor cells directly like classical chemotherapy.