age&#39;, &#39;development_stage_ontology_term_id&#39;, &#39;disease&#39;, &#39;disease_ontology_term_id&#39;, &#39;donor_id&#39;, &#39;is_primary_data&#39;, &#39;self_reported_ethnicity&#39;, &#39;self_reported_ethnicity_ontology_term_id&#39;, &#39;sex&#39;, &#39;sex_ontology_term_id&#39;, &#39;suspension_type&#39;, &#39;tissue&#39;, &#39;tissue_ontology_term_id&#39;, &#39;tissue_general&#39;, &#39;tissue_general_ontology_term_id&#39;, &#39;raw_sum&#39;, &#39;nnz&#39;, &#39;raw_mean_nnz&#39;, &#39;raw_vari