subgroups, subpopulations, subclasses, histologies, types, parameters, cardinality, phyla, heterogeneity, etiologies, genotypes, categories, loci, gram stain, stochasticity, variables, subsections, karyotype, histocompatibility, groupings, mononuclear, squamous, segments, epitope, univariate, macros, subfamilies, carcinoid, instantiations, metazoan, phenotype, hepatoma, exons, anterior pituitary, spinous, pca, phylogenies, subroutines, ingroup, transmembrane, classifications, autocorrelation, orfs, covariance, granulocytes, volvox, sarcomas, ribosomal rna, schemas, eoe, discriminant, proband, homologues, epistasis, foci, subtype, codons, factorial, mirs, umbilical vein, taxa, correlations, proteome, superfamily, cellularity, homozygote, metaplasia, domains, euchromatin, lymphoid, fibronectin, leydig cell, haplotype, entamoeba, enolase, dyads, alleles, multivariate, chordate, lymphocytic, tropomyosin, homozygosity, nucleoli, embryonal carcinoma, clusters, variants, mesenteric, vectors, lineages, heterozygote, lymphocytosis, chromatogram, cryptogenic, epithelia, bacteroides, papillary, peromyscus, monozygotic twin, alphas, polymorphism, trimer, syngeneic, subset, sets, subtrees, subcategories, subspaces, subproblems, subsamples, subprograms, subdomains, subclass, subgraphs, subgroup, subregions, subsystems, epitopes, modules

data hierarchy