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Gram-positive vs Gram-negative
Battlefield on Petri dish. Serratia marcescens (red colonies) besieged by Bacillus mycoides. Serratia appears to produce an anitibiotic that protects it from the invading Bacillus strain.
And the winner is (at least in this case):
PS: many species in the genus Bacillus are important producers of antibiotics. See here.
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