ID #1332

On wikipedia it says, "The tubulin dimers polymerize end to end in protofilaments. The protofilaments then bundle in hollow cylindrical filaments." But in the video online it showed that the dimers were joining together in a helical/spiral structure to create the microtubule, can you clarify which one is correct?

It's most likely a combination of both. I promise I won't ask that question on an exam.

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