[Letter: Temperature dependence of myosin fluorescence]

It was shown that an increase of temperature (from 0 to 37 degrees C) did not affect the maximum position of the myosin fluorescence spectrum and relative contribution of tyrosine to fluorescence intensity. The spectral band width increases to 2-3 nm. The I (t-o) relationship permits us to sugges that the temperature change causes structural changes of myosine molecules.