These arrows differ in shape and colour depending on interaction type.
Red arrows connect a gene with the upstream genes of network, and blue arrows with downstream genes.
Filled and hollow arrows reflect the mode of gene action - activation and repression correspondingly. This is sometimes required for better visualization of links between genes in cases where the network is large. A given gene may be selected by clicking with the mouse. Regulatory interactions with regulators and targets of the selected gene become highlighted, and these regulators and targets now appear in menus accessible with the UP and DOWN buttons. These genes are linked to HTML files which contain the information about them.