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MAP kinase mutants defective in CAT formation. (A) Wild-type strain with CATs (c); (B) cr-1 mutant lacking cAMP produces CATs; (C) Δmak-2 mutant lacking CATs; (D) nrc-1 mutant lacking CATs; (E) ham-2 mutant lacking CATs. Images were obtained by low-temperature scanning electron microscopy. Bar, 5 μm.
