and can you tell me what the interaction type is for ALA synthase?
SELECT distinct ( T1.interaction_type )  FROM medicine_enzyme_interaction AS T1  JOIN enzyme AS T2 ON T1.enzyme_id   =   T2.id WHERE T2.name   =   'ALA synthase'
interaction type for ALA synthase refers to retrieving the unique interaction_type from a table (medicine_enzyme_interaction) that is joined with another table (enzyme) on a common field (enzyme_id = id) where the enzyme name matches 'ALA synthase';