public boolean selectSiteInSamples(VariantContext vc) {
if ( samples == null || samples.isEmpty() )
return true;
// want to include a site in the given samples if it is *likely* to be variant (via the EXACT model)
// first subset to the samples
VariantContext subContext = vc.subContextFromSamples(samples);
if ( ! subContext.isPolymorphicInSamples() )
return false;
// now check to see (using EXACT model) whether this should be variant
// do we want to apply a prior? maybe user-spec?
if ( flatPriors == null ) {