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. 2008 May;131(5):445–453. doi: 10.1085/jgp.200809982

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© 2008 Dou et al.

This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.jgp.org/misc/terms.shtml). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 3.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/3.0/).

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Figure 2. — Sarcomere pattern, single twitch contraction and length force relationships. (A) High magnification photograph showing sarcomere patterns and the corresponding density record from the segment indicated with the white line in the photograph. Arrow indicates myoseptum, triangle indicates notochord. The approximate location of this area is indicated in Fig. 1 B showing a picture from a similar preparation. (B) Original recording of a single twitch elicited by electrical stimulation. (C) Relationship between sarcomere length and passive (open circles) and active (filled circles) force. Force values are expressed relative to the maximal active force, n = 7.