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pyo·cy·a·nin

or  pyo*cy*a*nine  n :  a toxic blue crystalline pigment C13H10N2O that is formed in the metabolism of a bacterium of the genus Pseudomonas (P. aeruginosa), gives a bluish tint to pus infected with this organism, is a quinone imine related to phenazine, and has antibiotic activity esp. toward gram-positive bacteria .
 
 

 
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