code: def populateFromRow(self, readGroupRecord):
          
          self._sampleName = readGroupRecord.samplename
          self._biosampleId = readGroupRecord.biosampleid
          self._description = readGroupRecord.description
          self._predictedInsertSize = readGroupRecord.predictedinsertsize
          stats = protocol.fromJson(readGroupRecord.stats, protocol.ReadStats)
          self._numAlignedReads = stats.aligned_read_count
          self._numUnalignedReads = stats.unaligned_read_count
          experiment = protocol.fromJson(
              readGroupRecord.experiment, protocol.Experiment)
          self._instrumentModel = experiment.instrument_model
          self._sequencingCenter = experiment.sequencing_center
          self._experimentDescription = experiment.description
          self._library = experiment.library
          self._platformUnit = experiment.platform_unit
          self._runTime = experiment.run_time
docs: Populate the instance variables using the specified DB row.