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===PDX Single-Cell RNA Seq=== '''Meduloblastoma tissue (PDX) from Weschsler-Reya Lab''' *Tissue was flash frozen on 10/19/2016 (3 separate chunks) *Transferred 1 chunk to -20C RNAlater ICE and stored at -20C on 11/29/2016 (i.e. overnight) *Isolated nuclei: :**Removed from -80C, washed briefly with PBS, coarsely chopped using scalpel (petri dish) :**Transfered to NEB in dounce on ice :**5 strokes with loose pestle -> ice 10 min :**5 strokes with loose pestle :**15-20 strokes with tight pestle - note: very difficult to dissociate - a lot of DAPI+ debris and jagged nuclei/tissue clumps. Clean intact nuclei are sparce. :**Filtered 50um filter :**Centrifuged - re-filtered (30um filter) before FACS -> sorted ~70K for DROP-seq :**Froze down remaining unsorted nuclei as potential bulk control ''Note: RNAlater-Ice seems to make the tissue tougher to dissociate or the cell membrane to dissolve... even worse than kidney tissue treated with regular RNAlater, although that was only for 6hrs''
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