1. I want to do Intracellular staining in different time points (day0, 3,5,7,9). Is it possible to keep samples for such long time and check at same time? I stain surface at FITC, PerCP Cy5.5 and APC, intracellular stain at PE.

2. Do I need one control sample for each day? I usually use non-activated cells as the control without using isotype.

Is it mandatory to use CS&T beads to set up a baseline on the to the baseline in order to compare results at different time points?

3.Should I fix for 20 min and then wash, keep sample in FACS buffer? 

Other information

Intracellular kit: Foxp3 / Transcription Factor Staining Buffer Set

Procedure: Surface stain --> Fix/Perm 45min --> Intracellular Stain 45min --> Fix

Fix buffer: PBS 1% formaldehyde.

Sincerely,

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