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. 

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