They cause the formation of tubules extending from cell membranes and become part of the tubules. Which of these activities are relevant to the movement of infection from cell to cell is unclear. The profile of activities of movement proteins suggests that the movement protein of one virus could facilitate the movement of another virus. Experiments from several laboratories show that, for particular combinations of viruses, such complementation does occur. We are examining the ability of tobamoviruses and cauliflower mosaic caulimovirus to complement each other's movement.
Preliminary results suggest that complementation occurs.
Most current methods for constructing evolutionary trees from molecular sequence data rely on multiple sequence alignments. These are mostly derived in a step-wise, or progressive, fashion. First, the most similar pair of sequences is aligned. Then the next most similar and so on. The progressive alignment assumes a set of relationships in similarity.