Fig. 3From: Microscopy of Physcomitrella patens sperm cellsApproximation of sperm number per antheridium. Fixed samples of three antheridia (a, b, c) with each visible spermatozoid indicated (a′, b′, c′). DNA was stained with DAPI. Panel b has been reused from Fig. 2. Scale bar 50 µmBack to article page