Labeling of host immune cells with magnetic nanoparticles v1

This protocol describes a technique to label the innate immune cells of a host squid, known as hemocytes, with commercially available magnetic nanoparticles (i.e., magdots). The goal of this technique is to label the hemocytes so that they could be reintroduced into the host animal and be tracked with downstream applications, such as fluorescence and magnetic particle imaging, or manipulated with techniques such as magnetic tweezers. The labeling technique can be applied to any cell type with phagocytic capabilities.