https://en.wikipedia.org/wiki/Basophil
Although basophil and mast cell preformed mediators of inflammation are granule associ- ated, the subcellular location(s) of this important precursor to the newly generated inflam- matory mediators has generally been attributed to the plasma membrane. Given the ubiquitous distribution of lipid bodies in mammalian cells and our demonstration by electron-microscopic autoradiography of [ 3 H]arachidonic acid within them (Figure 39), we think that lipid bodies may serve as a major source of this important precursor for the stimulus-provoked generation of eicosanoids by oxidative cascades.