 The RNA markers consist of RNA transcripts of various incrementing lengths.For example, the Lonza 0.5-9 kbp marker has bands marking 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, and 9 kilobase pairs.Markers are dissolved in a storage buffer, such as EDTA, and can have a shelf life of up to 2 years when stored at -80 °C.