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Fig. 6. The number of thick filaments within a 60-nm perimeter surrounding the edge of dense bodies measured (in micrographs such as that shown in Fig. 5) before and after a 30%-Lin situ length increase was imposed on the muscle. The decrease in number (mean±s.e.m.) immediately after the stretch is statistically significant (*, P<0.05). After adaptation at the stretched length, the number returned to the pre-stretch level.