英语翻译

题目

英语翻译
NrrA Directly Regulates Expression of hetR during Heterocyst
Differentiation in the Cyanobacterium Anabaena sp.Strain PCC 71201
Heterocysts are terminally differentiated cells of cyanobacteria
that are capable of fixing atmospheric nitrogen.Upon
limitation of combined nitrogen in the medium,particular vegetative
cells change their form into heterocysts with a regular
spacing of 10 to 15 cells (10,12,29).In the filamentous cyanobacterium
Anabaena sp.strain PCC 7120,about 10% of
genes on the chromosome are estimated to be upregulated
during heterocyst development (6,7).Heterocysts markedly
differ from vegetative cells in physiological and morphological
aspects (30).Heterocyst development provides an excellent
model for studying cell differentiation and multicellular pattern
formation.
The hetR gene is a master gene that regulates heterocyst
differentiation.While mutation in the hetR gene blocks early
steps in differ

答案

分太少,工作量太大!