ID #1351

What exactly are protofilaments? Are they the tubulin dimer, so 13 of the tubulin dimers make up the protofilament? Also, is a protofilament the complete horizonatal line of dimers if looking a microtubule?

Yes, what you suggested last is the correct answer. A "protofilament" is one of the 13 lines of tubulin dimers stacked on top of each other from one end to the other.

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