sequence length measurement datum input protein sequence length measurement datum input protein length A sequence length measurement datum which describes the number of positions of a protein undergoing analysis. 638bp input protein sequence length measurement datum https://github.com/obi-ontology/obi/issues/1579 https://orcid.org/0000-0002-1107-9135 Emma Griffiths https://orcid.org/0000-0002-9578-0788