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The channel has a large diameter of 0.8x1.1nm, and is non-selective for small ions. However, it has an upper exclusion size limit corresponding to molecular weights of about 600 Dalton of permeants. Because most metabolites have molecular weights lower than 600 Da and have been shown to pass through porin channels, porins are called general diffusion pores.
Widening is not needed for left-turn lane channelization where medians are 11 feet wide or. wider (see Exhibits 1310- 10b through 10d). For medians between 13 feet and 23 feet or. where the acceleration lane is not provided, it is desirable to design the left-turn lane.