Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_39 (mutated_from VARCHAR, plant_patent_number VARCHAR)
### Question:
What's the mutated having a patent number of US plant patent 9645?
### Answer:
SELECT mutated_from FROM table_name_39 WHERE plant_patent_number = "us plant patent 9645"