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Calcium spiking response to host-specific nod mutants. A, nodF strain JAS108. B, nodL strain RJW13. C, nodFL strain RJW14. D, nodH strain JT210. Representative traces of the change in fluorescence in root hairs responding to bacterial mutants lacking common nod genes. Bacteria were added at time = 0 min. Purified NF was added back to verify that the root hair was capable of initiating calcium spiking.
