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Yes, casein is playable

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"Casein" Definition

noun

A white, tasteless, odorless protein precipitated from milk by rennin. It is the basis of cheese and is used to make plastics, adhesives, paints, and foods.
a phosphoprotein of milk as.
One that is precipitated from milk by heating with an acid or by the action of lactic acid in souring and is used in making paints and adhesives.
One that is produced when milk is curdled by rennet, is the chief constituent of cheese, and is used in making plastics .