| http://www.w3.org/ns/prov#value | - de temperature, humidity, water, nutrients, gas (e.g., O2 or CO2 content or air circulation), chemicals (small molecules such as sugars and sugar derivatives or hormones such as such as phytohormones gibberellic or absisic acid, etc.) and the like.According to certain methods, expression of a nucleic acid encoding a Y. pestis antigen may be controlled by an exogenously inducible promoter.
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