Cytological, genetic, and biochemical characteristics of an unusual non‐<i><scp>C</scp>hlorella</i> photobiont of <i><scp>S</scp>tentor polymorphus</i> collected from an artificial pond close to the shore of <scp>L</scp>ake <scp>B</scp>iwa, <scp>J</scp>apan
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