I am attempting to run IF on neonate lung section (P2-P21) and am not seeing any fluorescence. I believe this is due to epitope masking.
Fix: O/N at four degrees with 4%PFA
Embedding: Paraffin
Retrieval attempt 1: Sodium Citrate 1hr @ 95 degrees C
Retrieval attempt 2: Sodium Citrate O/N @ 60 degrees C
Any advice or recommendations would be greatly appreciated.