Page "Guinea pig" Paragraph 65

Guinea pig strains used in scientific research are primarily outbred strains.

Aside from the common American or English stock, the two main outbred strains in laboratory use are the Hartley and Dunkin-Hartley ; these English strains are albino, although pigmented strains are also available.

Inbred strains are less common and are usually used for very specific research, such as immune system molecular biology.

Of the inbred strains that have been created, the two that are still used with any frequency are, following Sewall Wright's designations, " Strain 2 " and " Strain 13 ".