Effect of ARC3_41–598 on FtsZ1 assembly. Epifluorescence micrographs of S. pombe cells expressing FtsZ1-eYFP (green) and higher levels of ARC3_41–598–eCFP (A, red), lower levels of ARC3_41–598–eCFP (B), higher levels of eCFP (C), or lower levels of eCFP (D). Exposure times and image processing for cells in A and B were identical. Cells in C and D were taken from the same identically processed image; hence, differences in fluorescence intensity reflect differences in protein level. Dotted lines show cell outlines. Bars, 5 µm.