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Source:
p. 15, b. 468-493
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In A one can see in these bars 4 minor crossings-out. All concern cautionary accidentals that Chopin, after a moment of reflection, considered superfluous. The accidentals in the L.H. part – 
before c
in b. 490 and 
before B in b. 491 – warn us not to play notes peculiar to the G minor key, which is going to be confirmed only just in the next bar.
Compare the passage in the sources»
category imprint: Corrections & alterations; Source & stylistic information
issues: Cautionary accidentals, Deletions in A
notation: Pitch
Missing markers on sources:
FE1, FED, FES, FESf, GE1, GE2, GE3, EE1, EE2, EE3, A, FC