Using Operators on MGI Query Forms
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This help document answers the following questions about using operators on MGI query forms:

What are operators and how do they affect my query?

Operators narrow or expand the effect of a search. They usually appear on selection lists located next to a field. Examples are: begins, equals, ends, contains, less than, greater than, and so on. When a selection list is available, click the arrow beside it to see all the options available.

Maybe this is obvious, but what is the effect of the NOT operator?

Begins, equals, ends, contains, and like operators

One set of operators is comprised of begins, = (equals), ends, contains, and like; you can use these, for example, to filter what you are looking for.

"Ballpark" operators (between, less than, greater than, equal to)

Another set of operators lets you establish a relationship among values: between, equal to (=), less than (<), greater than (>), less than or equal to (<=), greater than or equal to (>=), not equal to (<>). These operators are useful for defining a ballpark search region when you are entering genome coordinates on MGI query forms (Genes and Markers, Alleles, SNPs, Sequences, Gene Expression, Probes, and so on). The is null operator defines an empty list; the is not null defines a set in which the contents are unknown.

In/not in, on/not on operators

The operators in/not in or on/not on, let you specify the presence or absence of values. As examples, you can use them to include or exclude specific chromosomes when searching for SNPs annotated to mapped markers or to include/exclude developmental stages when searching for gene expression

Check marks

Sometimes operators are activated by check marks: for example, clicking a NOT box puts a check mark beside a field or a list to choose items from to exclude from your search.

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