In medicine,<unk>  is a term named for British physician Archibald<unk> , who introduced the phrase "inborn errors of metabolism" in a lecture in 1908. The<unk>  comprises four inherited metabolic diseases: albinism, alkaptonuria, cystinuria, and pentosuria. Trick to learn PACA. ( Pentosuria, albinism, cystinuria, alkaptonuria.
Garrod's tetrad
Goldstein's toe sign
Abadie's sign of tabes dorsalis
Carnett's sign
Lockwood's sign
Hannington-Kiff sign
Dunphy sign
Hoover's sign 