How long, in kb (kilobases),  is a "Long interspersed nuclear element"?
[' A combination of molecular hybridization studies and long-range polymerase chain reaction was used to isolate a 6-kb full-length long interspersed nuclear element (LINE or L1)', 'LINE (7kb long interspersed nuclear element),', 'The retrotransposon known as long interspersed nuclear element-1 (L1) is 6 kb long, although most L1s in mammalian and other eukaryotic cells are truncated.']
['The retrotransposon known as long interspersed nuclear element-1 (L1) is 6-7 kb long,']
['6-7 kb']