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Neither RKN-resistant DZA045 (A) nor RKN-susceptible F83005 (B) accessions of Medicago appear to mount a hypersensitive response to invading M. incognita L2. Roots were stained with acid Fuchsin 67 hr after inoculation. Nematodes (stained red) are migrating between cells. Because it is in the vasculature system and slightly swollen, it is likely that the L2 in the susceptible host is beginning to establish a feeding site. .
