TSV ISA-Tab ISA-Tab Study file An ISA-Tab data set contains 1 or more Study file(s). A Study file follows the naming pattern s_*.txt and contains contextualising information for 1 or more Assays. It records the provenance of biological samples from source material through collection processes to sample material. ISA-Tab Study file (s_*.txt) contains sample metadata describing the subjects under study, their sources, characteristics, sampling methodology, and any treatments or manipulations applied. 1.26 ISA Study file ISA-Tab sample file txt