STRSeq BioProject hierarchy, accession numbers, and direct links to all levels. The highest-level of organization is the STRSeq umbrella project (PRJNA380127, http://ncbi.nlm.nih.gov/bioproject/380127), containing four sub-umbrella projects: (a) Commonly Used Autosomal STR Loci, (b) Alternate Autosomal STR Loci, (c), Y-Chromosomal STR Loci and (d) X-Chromosomal STR Loci. Each of these contains locus-specific sub-projects, which are the data-level projects containing GenBank sequence records.