All descendants in the ontology treeSource:
Starting from the selected nodes, recursively walks the ontology tree until it reaches the leaf nodes. Collects all visited nodes, which are the descendants (children) of the starting nodes.
descendants( terms, db_key = "go_basic", ids = TRUE, relations = c("is_a", "part_of", "occurs_in", "regulates", "positively_regulates", "negatively_regulates") )
Character vector of ontology term IDs or names. A mixture of IDs and names can be provided.
Character: key to identify the ontology database. For the available keys see
Logical: whether to return IDs or term names.
Character vector of ontology relation types. Only these relations will be used.
Character vector of ontology IDs. If the input terms are all
NULL is returned. The starting nodes won't be included
in the result unless some of them are descendants of other starting
Note: this function relies on the database manager, the first call might
take long because of the database load process. Subsequent calls within
a short period should be faster. See
descendants('GO:0005035', ids = FALSE) #>  "tumor necrosis factor receptor activity" #>  "death receptor activity" #>  "TRAIL receptor activity" #>  "TNFSF11 receptor activity" #  "tumor necrosis factor-activated receptor activity" #  "TRAIL receptor activity" #  "TNFSF11 receptor activity"