Data Item _ihm_entity_poly_segment.comp_id_begin
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General 
- Item name
- _ihm_entity_poly_segment.comp_id_begin
- Category name
- ihm_entity_poly_segment
- Attribute name
- comp_id_begin
- Required in PDB entries
- yes
- Used in currrent PDB entries
- No
Item Description
The leading monomer component of the polymeric segment.
This data item is a pointer to _entity_poly_seq.mon_id in the ENTITY_POLY_SEQ category.
Data Type 
- Data type code
- ucode
- Data type detail
- code item types/single words (case insensitive) ...
- Primitive data type code
- uchar
- Regular expression
- [][_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*
Parent Data Items 
Leading Parent Item
Subcategories
| Subcategory Name | Subcategory Description |
|---|---|
| mm_poly_res_label | The collection of entity id, comp id and seq id components of the label for a residue in a polymer. |