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He died from non-Hodgkin's lymphoma in Los Angeles on April 25, 1996 at the age of 75.

The deluge of information that emerges from these genome-scale investigations has stimulated a parallel development of new analytical frameworks and tools.

Topics: For example, suppose you need to create a validation for an address form that requires the user to enter a province if the address is not in the United States.Validations are primarily useful for associating error messages to display to the user with specific attributes on the model.It is also possible to use them to enforce data integrity for model instances, but that's not recommended unless the only way to modify the database is through model instances, or you have complex data integrity requirements that aren't possible to specify via database-level constraints.Unfortunately, sometimes there are situations where that is not possible.For example, if you don't have control over the schema and cannot add constraints, or you are using My SQL (which doesn't support CHECK constraints), it may be necessary to use a model validation to enforce the database integrity.