DiI⁺ cells in the circulation of inoculated embryos after 12 hours of culture. (A) Appearance of DiI⁺ cells sorted from blood (May-Grünwald-Giemsa staining). Original magnification, × 100. (B) Detail of sorted DiI⁺ cells. Original magnification, × 400. (C) Proportion of erythroid cells, macrophages, and other myeloid cells in the sorted DiI⁺ population at various somite stages. Numbers in each column indicate the means obtained from several independent experiments.