Supplementary Figure 6: Only minor structural changes are evident in substrate-free and substrate-trapped needle complexes.
From: Structure of a pathogenic type 3 secretion system in action
Surface views of half-sectioned three-dimensional volume of substrate-free (gray) and substrate-trapped (yellow) needle complexes show only minor differences at the cup and socket region of the export apparatus (gray circle). The inner rod is substantially better defined in reconstructions obtained from substrate-free (gray) than in substrate-trapped (yellow) needle complexes, which could indicate a higher flexibility of the inner rod during substrate transport.
