Assertion: microtubule's protofilament | /r/HasProperty | 13 protofilaments
Facets:
Source sentences:
text: Microtubules were classified in two main categories: those with unskewed protofilaments (13 protofilaments with 3-start helices) and those with skewed protofilaments (12-, 13(s)-, 14- and 15-protofilament microtubules).