RT-PCR is a PCR test that is designed to detect and measure RNA. Although initial PCR tests amplified DNA, many viruses and other biological components (for example, mitochondria) utilize RNA as their genetic material.
Willits is at the center of Mendocino County and its redwood forests. The Sherwood Valley Rancheria of Pomo Indians of California are headquartered here. Located at the center of Mendocino County in the Little Lake Valley, 20 miles (32 km) north of Ukiah on U.S. Route 101 (otherwise known as the Redwood Highway).
In the community of Calpella, SR 20 merges with US 101 for the next 15.5 miles (24.9 km). South of Willits, as the freeway portion ends, US 101 ascends the 1,953-foot (595 m) Ridgewood Summit, the highest elevation along the route's 807-mile-long (1,299 km) trek through California.