Children('protein', 'Missing')
#> [1] "Missing POV" "Missing MEC"
Children('protein', 'Missing POV')
#> character(0)
Children('protein', c('Missing POV', 'Missing MEC'))
#> character(0)
Children('protein', c('Missing', 'Missing POV', 'Missing MEC'))
#> [1] "Missing POV" "Missing MEC"