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:

Phosphorylation of Thr545 of ACAP4 is essential for parietal cell activation Since parietal cell activation involves ezrin-mediated reorganization of apical membrane cytoskeleton (11), we sought to probe the localization of ACAP4 using immunofluorescence microscopy.
Method