definiens: means:(a ) any RSV - specific antibody discovered or identified by or on behalf of [COMPANY], on or before the EffectiveDate, in any biological material obtained from a Donor, as listed on Exhibit A hereto ( each, an ) ; or(b ) any modified or derivative form of any Initial RSV Antibody ( including an scFv or Fab ) created by or onbehalf of [COMPANY] ( whether before, on, or after the Effective Date ), including any fragment or pegylated version(whether or not including amino acid changes ) of an Initial RSV Antibody and including chemically modified versions(including associated amino acid substitutions ) of an Initial RSV Antibody, and including an antibody designed orderived using the Sequence of any Initial RSV Antibody, polynucleotide encoding it, and any cell line or cellular orbacterial expression system or vector expressing any Initial RSV Antibody or incorporating the polynucleotideencoding an Initial RSV Antibody ( in each case, an ) . For clarity, any modified orderivative form of any [COMPANY] Derived Antibody created by or on behalf of [COMPANY] shall itself be an [COMPANY] DerivedAntibody