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Thin-section EM analysis of double mutant strains. Photomicrographs of (A) ist1Δ did2Δ, (B) ist1Δ vta1Δ, and (C) did2Δ vta1Δ mutant cells. (D and E) Enlargements of the class E compartments that are visible in ist1Δ vta1Δ and did2Δ vta1Δ cells, respectively. n, nucleus; v, vacuole.
