--- 
alleleRequest: 
  alternateBases: ~
  assemblyId: ~
  datasetIds: ~
  includeDatasetResponses: ~
  referenceBases: ~
  referenceName: ~
  start: ~
  variantType: ~
beaconId: org.ensembl.rest.grch37
datasetAlleleResponses: ~
error: 
  errorCode: 400
  errorMessage: User provided assemblyId () does not match with dataset assembly (GRCh37)
exists: ~