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:

As previous studies had shown that CD39 and CD73 are rate limiting for extracellular adenosine generation (9, 15), we next investigated transcriptional consequences of cyclic stretch on CD39 and CD73 expression patterns in vitro and in vivo.
Background