agent_in_compromised_process artificially mutated Brucella Brucella intracellular growth Brucella cydD mutant MUTATION: The cydB and cydD mutants are also defective for the intracellular growth of B abortus and B suis, suggesting that functional cytochrome bd oxidase is required for growth in an intracellular environment [Kim et al., 2003]. See PMID:12761078