What is protoporphyrin ix's substrate?
CREATE TABLE table_name_55 (substrate VARCHAR, product VARCHAR)
SELECT substrate FROM table_name_55 WHERE product = "protoporphyrin ix"
<s>[INST] Write mssql query to answer the following question given the database schema. Schema: CREATE TABLE table_name_55 (substrate VARCHAR, product VARCHAR) Question: What is protoporphyrin ix's substrate? [/INST] SELECT substrate FROM table_name_55 WHERE product = "protoporphyrin ix" </s>