P. syringae pv. tomato strains were grown overnight in KB to stationary phase. Two hundred microliters of each culture was plated on NB agar plates supplemented with 5 mM CaCl2. The strains were grown for 1 day and then desiccated with a vacuum concentrator. The desiccated cultures were ground into a powder and analyzed on a Scintag Theta-Theta X-ray diffractometer (ThermoFisher Scientific, Waltham, MA) at the Cornell Center for Materials Research, Cornell University.
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