Contents: (Small 7/2015)

Sperm MigrationThe motion of spermatozoa in a confi ned space is investigated by V. Magdanz, O. G. Schmidt, and co-workers using transparent microtubes.On page 781, cells swimming through microtubes are shown to have a higher directionality than cells swimming unconfi ned on a planar glass surface.In addition, the straight line velocity of spermatozoa swimming through 20-45 m wide microtubes is increased compared to their velocity on a planar surface.These results indicate that the tubular microenvironment may play an important role in spermatozoa migration.