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function showHide(shID) { | function showHide(shID) { | ||
if (document.getElementById(shID)) { | if (document.getElementById(shID)) { | ||
− | if (document.getElementById(shID+'-show').style.visibility != ' | + | if (document.getElementById(shID+'-show').style.visibility != '') { |
− | document.getElementById(shID+'-show').style.visibility = ' | + | document.getElementById(shID+'-show').style.visibility = ''; |
document.getElementById(shID).style.display = 'block'; | document.getElementById(shID).style.display = 'block'; | ||
} | } |
Revision as of 13:27, 3 September 2017
Clustered regularly interspaced short palindromic repeats (CRISPR) are segments of prokaryotic DNA containing short, repetitive base sequences. These play a key role in a bacterial defence system, and form the basis of a genome editing technology known as CRISPR/Cas9 that allows permanent modification of genes within organisms.
In a palindromic repeat, the sequence of nucleotides is the same in both directions. Each repetition is followed by short segments of spacer DNA from previous exposures to foreign DNA (e.g., a virus or plasmid). Small clusters of cas (CRISPR-associated system) genes are located next to CRISPR sequences.
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