Table: porphyria_data
Columns: enzyme
location
substrate
product
chromosome
omim
porphyria

Question: What is the location of the enzyme Uroporphyrinogen iii Synthase?
SQL: SELECT "location" FROM porphyria_data WHERE "enzyme" = 'uroporphyrinogen iii synthase'

Question: What is protoporphyrin ix's substrate?
SQL: SELECT "substrate" FROM porphyria_data WHERE "product" = 'protoporphyrin ix'

Question: Which substrate has an OMIM of 176000?
SQL: SELECT "substrate" FROM porphyria_data WHERE "omim" = 176000