WO2012169938A2 PCT RU2012 000447 RU2012000447W WO2012169938A2 WO 2012169938 A2 WO2012169938 A2 WO 2012169938A2 RU 2012000447 W RU2012000447 W RU 2012000447W WO 2012169938 A2 WO2012169938 A2 WO 2012169938A2 Authority WO WIPO PCT Prior art keywords cells pfos gel characterized cryopreservation Prior art date 2011 06 09 Application number