Hypervariations of a Protease-Encoding Gene, PD0218 (pspB), in Xylella fastidiosa Strains Causing Almond Leaf Scorch and Pierce's Disease in California

J. Chen, E. Civerolo, K. Tubajika, S. Livingston and B. Higbee

Applied and Environmental Microbiology 74 ( 12 ): 3652 - 3657 , 2008