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CRISPR-Cas9 gene deletion in Glycine max - Printable Version

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CRISPR-Cas9 gene deletion in Glycine max - gia.pa - 06-21-2018

Hi, i'm a bachelor student seeking for an explanation about genetically engineered Glycine max (soybean). 
During the project I was following, CRISPR-Cas9 mediated FAD2-2 gene deletion was performed on the plant seed. 
During sgDNA design though, it was done a blast of G.max FAD2-2 against Phsycomitrella patens FAD2-2. Since the similarities were high (99%) , the sgRNA was designed based on P. patiens sequence.
Why sgRNA is preferred to be designed based on P. patens FAD2-2 sequence?