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Structure of axoneme doublet microtubules. Cross-section of ciliary axoneme doublet microtubules. A- and B-tubules are shown. Tubulin protofilaments are colored gray and numbered. Microtubule inner proteins (MIPs) and filamentous MIPs (fMIPs) are distinguished by color as denoted in the table to the right. Adapted from Ichikawa and Bui (2018) and Stoddard et al. (2018).
