supernatant fractions obtained after high speed centrifugation ( 1 h at 100 000 x g ) of homogenates from whole ovaries , oocytes as well as from separated nuclei and ooplasms of xenopus laevis contain distinct 22 s particles which have been purified and characterized by sucrose gradient centrifugation , ion exchange chromatography on deae-sephacel and fast protein liquid chromatography ( fplc ) .
C0029045
oocytes
C1518587
ooplasms