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Vcf2Adam uses SB field instead of FS field for fisher exact test for strand bias #923
https://github.com/bigdatagenomics/adam/blob/master/adam-core/src/main/scala/org/bdgenomics/adam/converters/VariantAnnotationConverter.scala#L86 is where the conversion attribute is defined.
Couldn't find any hard documentation on this field but I'm guessing that this SB is just the difference of the number of reads from the positive strand versus the negative strand.