Extrusion rate (A) and morphology (B) of PB1s. LinTao Fei DiaoYun Won KangJung Eun LeeJae Kyo KimDong Il JinDong 2013 <p>The number of oocytes examined in each group is given in parentheses. G1, G2, G3, G4, and G5 represent Grade 1, Grade 2, Grade 3, Grade 4, and Grade 5, respectively.</p>