A. Immunofluorescence of FLAG (red) and F-actin (gray) in oocytes after microinjection of negative control or mouse Mos siRNAs combined with or without wild-type human MOS or MOS variants mRNAs and culture in medium with 2.5 µM milrinone for 24 h, followed by release to maturation (n=15-20 oocytes each group). Scale bar= 10 µm. 