mutations described in strains.tsv

[lingxuan85511]

Dear All,

Thank you for your fantastic work, which is really impressive.
I am a little confuse about the information desrcibed in strains.tsv. Does the column named "mutations" contain all mutations in each lineage compared to the reference SARS-CoV-2 genome? Or are they only shared mutations among some isolates in this lineage? As your Science paper indicating that some lineages contains highly divergent fitness than others, like B.1.1.