For the Reactome analysis, the results are divided by cell type and direction of the results (up,down). While the colour of the dot is determined by an adj p.value < 0.05, and the dot size is determined by the absolute LOR (logarithm 2 odds ratio in absolute value) (a larger size implies a larger absolute LOR, i.e. a larger overrepresentation of this pathway).
For the Gene Ontology analysis, the results are divided by cell type and direction of the results (up,down). While the dot colour is determined based on a p.value < 0.05, and the dot size is determined by the -log10(p.value) (a larger size implies a more significant p-value).