MOs (5′-CCGCCCTGGCAAGTGCGGACGA-3′) for depleting murine Cyclin B2 were synthesized by Gene Tools according to mCCNB2 (NM_007630; encoding Ccnb2; Gui and Homer, 2013 (link)). H2B-mCherry and MAP7-EGFP cRNAs were made from a pMDL-H2B-mCherry vector and a pGEM-MAP7-EGFP vector through in vitro transcription (T3 or T7 mMessage mMachine [Ambion] according to the manufacturer’s instructions), respectively. Mouse Ccnb2 gene (NM_007630.2) was cloned into a pcDNA3.1-Venus vector, and its cRNA was prepared using T7 mMessage mMachine (Ambion). Mouse Ccnb1 gene (NM_172301.3) was cloned into a pCS2+ vector, and its cRNA was prepared using SP6 mMessage mMachine (Ambion). All cRNAs were purified with RNeasy Mini kits (QIAGEN), dissolved in nuclease-free water, and stored at −80°C. A concentration of 500 ng/µl was used for microinjection. Microinjection was performed with a Nikon operating system.