Subsequent work addressed several technical problems in assessing cell differentiation.[1] For these experiments, Reddick used White Plymouth Rock chicken embryos.[8] One of the questions she addressed was whether nerve cells in the post-otic chick medulla became syncytial during development.[8] To try to get single developing nerve cells with long processes visible in one plane of focus under the microscope, Reddick used a “smear” technique of flattening tissue before fixing and staining it.[8] She also found that what had been thought of as two different cell types, was actually one cell type in different phases of the cell cycle.[8] Some of the cells were mitotic, and others were in the interphase.[8]