Data Item _bond_annotation.atom_isotope_number_2
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General 
- Item name
- _bond_annotation.atom_isotope_number_2
- Category name
- bond_annotation
- Attribute name
- atom_isotope_number_2
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
The mass number for the chemical element defined by the tag '_Atom_type'
or any of its related tags.
Data Type 
- Data type code
- int
- Data type detail
- int item types are the subset of numbers that are the negative or positive integers.
- Primitive data type code
- numb
- Regular expression
- -?[0-9]+