class CohortDataSourceAssay{
      String name;
      String displayName;
      bool selected;
      List<String> platforms = new List<String>();

      CohortDataSourceAssay();
    }

<data-source-assay *ngFor="let assay of dataSource.assays"></data-source-assay>

<div class="dataSourceAssay">
        <material-checkbox [(ngModel)]="assay.selected" (ngModelChange)="onCbxChange($event)">{{assay.displayName}}</material-checkbox>
        <material-dropdown-select class="selectStyle"
                                  [disabled]="!assay.selected"
                                  [buttonText]="platformLabel"
                                  [selection]="assaySequencingPlatforms"
                                  [options]="sequencingPlatforms"
                                  [itemRenderer]="itemRenderer">
        </material-dropdown-select>
    </div>