Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE institution ( institution_id VARCHAR )
TABLE: CREATE TABLE protein ( institution_id VARCHAR )

### Question ###
How many institutions do not have an associated protein in our record?

### Accurate SQL ###

SELECT COUNT(*) FROM institution WHERE NOT institution_id IN (SELECT institution_id FROM protein)