Table 2.

Comparison of PANTHER/X Abbreviated Ontology and Gene Ontology (GO)

	PANTHER/X	Gene ontology (GO)
Number of categories for molecular function	244	4752
Number of categories for biological process	249	4041
Maximal level of depth for molecular function	3	12
Maximal level of depth for biological process	3	12
Average level of depth for molecular function	2.16	5.33
Average level of depth for biological process	2.15	6.42

The “number of categories for molecular function” and “number of categories for biological process” are the number of distinct terms in each ontology. The “maximal level of depth” is the maximum number of levels separating the most general “top level” terms from the most specific “progeny” terms. The “average level of depth” is calculated by dividing the sum of each category's level by the total number of categories. If the same category appears multiple times in the ontology, all of its occurrences will be calculated. The “top level” molecular function (GO:0003574) and biological process (GO:0008150) terms are the level 0 categories and were not included in the calculation.