Data Item _exptl_crystal.density_Matthews
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General 
- Item name
- _exptl_crystal.density_Matthews
- Category name
- exptl_crystal
- Attribute name
- density_Matthews
- Required in PDB entries
- no
- Used in current PDB entries
- Yes, in about 83.3 % of entries
Item Description
The density of the crystal, expressed as the ratio of the
volume of the asymmetric unit to the molecular mass of a
monomer of the structure, in units of angstroms3 per dalton.
Ref: Matthews, B. W. (1968). J. Mol. Biol. 33, 491-497.
Additional Descriptive Information for Depositors
Vm/M : Vm= unit cell volume and M= total molecular weight of molecules/cell
Data Type 
- Data type code
- float
- Data type detail
- float item types are the subset of numbers that are the floating numbers.
- Primitive data type code
- numb
- Regular expression
- -?(([0-9]+)[.]?|([0-9]*[.][0-9]+))([(][0-9]+[)])?([eE][+-]?[0-9]+)?
Advisory Boundary Conditions
| Minimum Value | Maximum Value |
|---|---|
| 1.5 | 5.6 |