Here, we report that FtsZ1 and FtsZ2 can heteropolymerize into a contractible ring ex vivo. Fluorescently labelled FtsZ1 and/or FtsZ2 formed single rings in cells of the yeast Pichia pastoris.

Problem: Is there an integer k such that every 5-connected graph of order at least k contains a nonempty set of at most k edges such that the graph obtained by contracting these edges (and removing ...