Deletion of SWI4 or SWI6 results in dramatic changes in growth pattern, including cell enlargement and induction of fila-ments, in contrast to deletion of MBP1. (A) Cells from strains BH440 (MBP1/MBP1 SWI6/SWI6 SWI4/SWI4 URA3+ HIS1+), BH261 (mbp1Δ::URA3/mbp1Δ::HIS1), BH120 (swi6Δ::URA3/swi6Δ::HIS1), and BH185 (swi4Δ::URA3/swi4Δ::HIS1) were incubated in minimal medium overnight and then diluted into fresh medium and incubated for 7 h at 30°C. (B) Strains BH120, BH185, and BH440 at higher magnification. Bar = 10 μm.