SACs are those genes with expression up-regulated during leaf senescence. Class I SACs are expressed only during senescence (senescence-specific). Class II SAGs have a basal level of expression during early leaf development, but this level increases during senescence.
Which Sample Rate to use. 44.1 kHz. 44.1 kHz (44100 Hz) is the sampling rate of audio CDs giving a 20 kHz maximum frequency. 20 kHz is the highest frequency generally audible by humans, so making 44.1 kHz the logical choice for most audio material.
By default, playback always starts from the beginning of a track. This can be difficult if you want to focus your attention on a piece in the middle, or near the end. You can change where playback begins by setting the playback start marker. You can do this by clicking white area just above the grid. A blue arrow icon will be placed where you click.