modular_skyrat/master_files/code/datums/components/damage_tracker.dm

ORGAN_ABSENCE_SPECIES_NORMAL	The organ was absent because the species simply doesn't have one.
ORGAN_ABSENCE_INJURY	The organ should have been there and wasn't.
/datum/component/damage_tracker	This component tracks the original damage values of a mob when it is attached.
/datum/component/damage_tracker/human	This does the same as it's parent, but it also tracks organ damage.

Define Details

The organ should have been there and wasn't.

The organ was absent because the species simply doesn't have one.