Data Item _sample.preparation_date
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General 
- Item name
- _sample.preparation_date
- Category name
- sample
- Attribute name
- preparation_date
- Required in PDB entries
- no
- Used in currrent PDB entries
- No
Item Description
Date the sample was prepared.
Data Type 
- Data type code
- yyyy-mm-dd
- Data type detail
- Standard format for CIF dates.
- Primitive data type code
- char
- Regular expression
- [0-9]?[0-9]?[0-9][0-9]-[0-9]?[0-9]-[0-9][0-9]