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望风的蜗牛

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[求助] 关于 trans-sulfuration pathway中 两种关键酶CSE 和 CBS 的问题

给我 大侠, 小弟是非生物学专业的,课题需要,想请教几个问题:
1、Cystathionine γ-lyase (CSE)和 Cystathionine-β-synthase(CBS)这两种酶 在所有的细胞中都存在么,在那些细胞中的含量比较高 ?
2、文献中提及的 CSE overexpression 一般要如何做到,文献中给出这段话:Cloning of CSE cDNA and Stable Transfection—PCR was used to
mplify the open reading frame of CSE (GenBankTM accession numberAY032875) from rat vascular tissues using the primers 5-CGTCCCA-
GCATGCAGAAGAA-3 and 5-CAGTTATTCAGAAGGTCTGGCCC-3. The amplified open reading frame of CSE was subcloned into TA clon-
ing vector (PCR4-TOPO). Positive clone containing CSE open reading frame insert was sequenced to confirm the accuracy of the inserted CSE
sequence. 大致的意思是什么 ?
3、有没有商品化的CSE overexpression 的细胞株可以直接买到?

再次感谢各位大侠!
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