miRNA promoter ? - how to discover MicroRNA promoter element (Oct/18/2006 )

Hi, every1
Although much effort has been focused on elucidating the mechanism of miRNA target gene regulation, relatively little is known and published about the regulation of miRNA genes themselves. The nature of miRNA promoter elements remains one of the most interesting open problems in the study of miRNA biogenesis.
here is an article about "MicroRNA promoter element discovery in Arabidopsis " Your opinion?

why dd you mask the lines?