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(a) 2D class average of the rings. The red dashed circle indicates density that may be attributable to the variable domain. (b) 2D class average of infrequent, orthogonal or “side” views used as a constraint during model building; (c) “top” and (d) “side” projections of the model; (e) “top” and (f) “side” views of the final model rendered as ribbons. Bars =100Å. Green: G-domain, Red: BSE, Purple: Stalk.
