| Feature | S_region |
| Definition | switch region of immunoglobulin heavy chains; involved in the rearrangement of heavy chain DNA leading to the expression of a different immunoglobulin class from the same B-cell |
| Optional Qualifiers |
/allele="free text" /gene="free text" /gene_synonym="free text" /map="free text" /note="free text" /product="free text" /pseudo /standard_name="free text" |
| Parent Key | misc_signal |
| Organism scope | eukaryotes |