CDR Sequence Export

Get complementarity-determining region (CDR) sequences from your antibody for downstream design, humanization, or analysis. Visual Antibody identifies CDR-H1, CDR-H2, CDR-H3 and CDR-L1, CDR-L2, CDR-L3 using Kabat (and IMGT where applicable). This page explains where to get CDR sequences and how to use them.

What you can export

CDR sequences (amino acid strings) for each loop—either by copying from the Sequence Analyzer results or by exporting in a structured format when the tool supports it. CDR boundaries follow Kabat/IMGT numbering. You can use these sequences for library design, grafting, or compatibility checks with structural data from the CDR Highlighter.

How to get CDR sequences

Sequence Analyzer (CDR/Kabat) — Enter your heavy or light chain sequence (1-letter or 3-letter). The tool returns CDR1, CDR2, and CDR3 for the chain with Kabat numbering. Copy each CDR from the results panel or download the PDF report, which includes all CDR sequences for your records.
CDR Highlighter — Load an antibody PDB (e.g. from RCSB). The viewer highlights CDR loops in 3D. Use it to correlate sequence (from the Sequence Analyzer) with structure; export a PNG screenshot for presentations. For the actual CDR sequence text, use the Sequence Analyzer with the chain sequence.

Formats and workflow

CDR sequences are shown in the Sequence Analyzer results and in the PDF report. Copy-paste into your notebook or spreadsheet. For full export formats (PDB, PNG, PDF, CSV) see Export formats. For numbering conventions (Kabat vs IMGT) see Antibody numbering systems.

Export · Export formats · Sequence Analyzer · CDR Highlighter · Antibody numbering