Fig. 1 Loss of Rrm4 results in disturbed filamentous growth. (A) Filament of laboratory strain AB33 expanding at the apex (right) and inserting retraction septa at the basal pole (left). This leads to the formation of empty sections. (B) Deletion of rrm4 causes no aberrant growth phenotype in yeast form. (C) Loss of Rrm4 leads to bipolar growth. The initial cell (center) switches to filamentous growth by expanding at both ends (size bar = 10 µm). Pictures taken from Vollmeister et al 2012 FEMS Microbio Rev.