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Representative images of Arcella lineages used in this study. (a) A. hemisphaerica Blue lineage. (b) A. hemisphaerica Red lineage. (c) A. vulgaris WP lineage. (d) A. vulgaris SC lineage: The image shows six individuals undergoing plasmogamy, where multiple individuals fuse their cytoplasm. It is unknown whether nuclear fusion also occurs. Images a, b and d are Hoffman interference contrast, image c is differential interference contrast. Scale bars are 50 um.
