Ta cooitinagh arthropodyn jeant ass kitin[noa] (chitin) son y chooid smoo, as proteenyn, lipaidyn as catecholameenyn myrgeddin. Ta eddyr-chianglaghyn jannoo eh neulhoobagh. Ta neulhoobaght y chutinagh croghey er ny proteenyn hene t'ayn, as coreir ny kitin as ny catecholameenyn. Ta proteenyn s'geayrey ny s'buiggey.