What do the terms LINE and SINE mean?

AI Thread Summary
LINE stands for Long Interspersed Nuclear Elements, while SINE refers to Short Interspersed Nuclear Elements. Both are types of retrotransposons found in DNA, playing significant roles in genetic variation and evolution. LINEs are typically longer and can code for proteins, whereas SINEs are shorter and do not code for proteins but rely on LINEs for their replication. These elements contribute to genomic diversity and can influence gene expression. Understanding LINEs and SINEs is crucial for studying genetic mechanisms and evolutionary biology.
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in this picture, there is a legend with the terms LINE and SINE in it
http://i.imgur.com/IGJfm.png

what do the terms LINE and SINE mean? I mean what do they stand for and what is their purpose in DNA. I have tried to look them up but it keeps going to math.
 
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