You will be presented with a citation segment from the section of a research paper. Classify the intent behind this citation by choosing from one of the following categories:

- Method: Cites the paper for its methodology or procedure.
- Background: Cites the paper to provide background information.
- Result: Cites the paper for its findings or results.

Your answer should be a single word from the following list of options: ["Method", "Background", "Result"]. Do not include any other text in your response.

Citation sentence:

For these experiments, RNA was purified using the TRIzol procedure (Invitrogen, Carlsbad, CA), and cDNA was generated using the avian myeloblastosis virus reverse transcriptase (Promega, Madison, WI); 5 g of cDNA were used for the subsequent PCRs.
Western analysis of HPOX and HOGA expression.
Method