Figure 3 .

Excerpt of BKO showing three template bricks associated with the term ‘stimulatory activity’ blue(BKO:0000075). This excerpt is captured from the SBGN bricks website where the ontology can be navigated (sbgnbricks.org/BKO/full/explore/terms/all/). The parent term ‘modulatory activity’ (BKO:0000059) and the descendant term ‘stimulatory activity’ (BKO:0000075) both have related template bricks associated with them. The presence of these bricks is indicated by a bright blue ‘BRICKS’ label next to the term. When the bricks are displayed, as in the case of ‘stimulatory activity’, the box containing ‘BRICKS’ turns to a red colour. Some terms, such as ‘molecular function’ (GO:0003674) do not have any associated PD bricks, denoted by the pale blue ‘BRICKS’ label. The pale grey arrow to the left of the term ‘transporter activity’ (GO:0005215) indicates that the term has no further descendants. Figure 1 includes instances of the first and last template bricks (BKO:0000007 and BKO:00000014, respectively).