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S. meliloti host-specific nod genes confer upon R. leguminosarum bv viciae the ability to trigger calcium spiking in alfalfa. Representative traces of change in fluorescence in alfalfa root hairs exposed to: A, RJW1 (A34 pRmJT5); or B, RJW18 (A34 pRmS210). In B, the ability of the root hair to initiate calcium spiking is demonstrated after exposure to wild-type S. meliloti NF.
