The melodic variants in b. 85 and 87 of the motif opening the majority of the phrases of this theme were introduced only just at the stage of writing Stichvorlage autographs. Such a diversification of recurring motifs is typical of Chopin and would frequently appear in the final stages of shaping particular pieces, cf., e.g. the Mazurka in G Minor, Op. 24 No. 1, b. 57 and 59.
The layout of the melody's notes in b. 85 in AF shows that the a
1 quaver was added there to the g1 note, which was initially a crotchet. At the same time, Chopin forgot about the 
before this note, which was corrected in FE (→EE).
Compare the passage in the sources »
category imprint: Differences between sources; Corrections & alterations
issues: Corrections in A, Main-line changes
notation: Pitch