Example 2: 1  a sporadic form, which is caused by a somatic mutation in each of the two RB genes in a cell. 2  a familial (inherited) form, which is caused by a somatic mutation to one RB gene in a cell that already has one mutant RB gene inherited through the germline from a parent.
For the month of September 2012, Ketchikan reported average temperatures of 53.3Â°F, 0.8Â°F above the long-term mean of 52.5Â°F. The maximum temperature for the month was 67Â°F, which occurred on the 7th, while the minimum (41Â°F) was reported on the 16th.
Ketchikan averages 162 inches (13.5 feet) of precipitation annually, including 32 inches of snowfall. Established originally as a fishing camp, Ketchikan today bustles with activity. Ketchikan almost seems today like it had been built for its many visitors. The Ketchikan Airport is located on its own island, Gravina Island. From Ketchikan's airport it is a short ferry ride across Tongass Narrows to the city of Ketchikan.