Brownian movement of LDs isolated from mouse MII oocytes. LDs isolated from MII oocytes by using a two-step centrifugation technique (see Box 2) were packed into an empty oocyte in which the oocyte contents were removed beforehand and therefore only the zona pellucida remained intact. This video (http://movie-usa.glencoesoftware.com/video/10.1530/REP-21-0238/video-1) is available from the online version of the article at https://doi.org/10.1530/REP-21-0238.