Parallel Coordinate Plots are used to explore the possible relationships between variables. In this particular parallel coordinate plot each Drosophilia gene is represented by one parallel axis, while the expression leveles of each cell are plotted as an individual point on the axis. Each cell is then represented by a polyline, and we are able to visualize an otherwise complicated set of data: the expression of multiple genes at the same time (in parallel). This plot was used to organize the data collected on the relationship between DNA and genetic expression with regards to animal development.
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