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Indirect immunofluorescent microscopy was used to study the distribution of elongation factor 2 (eEF-2) in fixed human skin diploid and mouse embryo fibroblasts. It was found earlier that some of the eEF-2, ribosomes and initiation factor 2 (eIF-2) are co-localized with a part of the actin microfilament bundles in these cells (Gavrilova et al., 1987; Shestakova et al., 1991). Here it has been shown that inhibition of protein synthesis either by inactivation of eEF-2 itself with diphtheria toxin or by inactivation of ribosomes with ricin does not abolish the distribution of eEF-2 along the actin microfilament bundles. At the same time, the disassembly of actin microfilaments by cytochalasin D results also in the disappearance of eEF-2- carrying threads. This means that the eEF-2-carrying threads do not exist per se, and that the organization of eEF-2 in visible "filaments" depends upon the integrity of the actin cytoskeleton.
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