CSLD activity and actin stabilize the nascent cell plate. Cell divisions in moss protonemata expressing mScarlet-CSLD6 (magenta in merge) and mEGFP-tubulin (green in merge) and stained for callose with aniline blue (blue in merge). (A) Cell without drug treatment. Also see Video 8. (B) Cell treated with 10 µM DCB. The cell plate buckles (18:00 and 25:00) but straightens again afterward (35:00 and 50:00). Also see Video 8. (C) Cell treated with 25 µM LatB. Also see Video 9. (D) Cell treated with 25 µM LatB and 10 µM DCB. Also see Video 10. Scale bars, 5 µm. Time stamps, min:sec.