Given the task definition and input, reply with output. In this task, you're given a paragraph from the research paper and your task is to generate a suitable title for the research paper based on the given paper. Under 100 words is a good title length.

1 g KHCO 3 8.3 g NH 4 Cl 37.2 mg EDTA-Na 2 Adjust volume to 1,000 ml with nano-pure H 2 O and filter through a 0.2 m filter Store at room temperature CD4 + T cell responses have been shown to be protective in many respiratory virus infections. In the respiratory tract, CD4 + T cells include cells in the airway and parenchyma and cells adhering to the pulmonary vasculature. Here we discuss in detail the methods that are useful for characterizing CD4 + T cells in different anatomic locations in mouse lungs.
HHS Public Access Author manuscript Simultaneous Intranasal/Intravascular Antibody Labeling of CD4 + T Cells in Mouse Lungs