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The fine structure of myofi_laments in vertebrate smooth muscle is still obscure because of the difficulty in demonstrating intracellular structure in the electron microscope. The present interest of this field is focused on the problem of how myosin filaments exist in the natural state. Although several reports have indicated the presence of two types of filaments, in some studies (1-3) the reported diameter of the purported thick filaments, less than 60-70 A, seemed to be too small, or in other studies the thick filaments were observed only under a specific condition, in the presence of coUagenase (4) or in acid pH (5). At the present time, vertebrate smooth muscle is generally considered to consist of one type of filament containing both actin and myosin filament in the natural condition, from the evidence provided by electron micrographs (6-9) and X-ray diffraction diagrams (I0, 11). The present studies were intended to clarify the fine structure of mammal ian smooth muscle, paying special attention to the question of whether or not there exist two types of filaments under nearly physiological conditions. M A T E R I A L S A N D M E T H O D S

MYOFILAMENTS IN SMOOTH MUSCLE OF GUINEA PIG'S TAENIA COLI