PLATE 3 
EXPLANATION OF FIGURES 
13 Culture 636 (same culture as fig. 9). Endothelial cell from mid part of 
outgrowth. Liver, 10-day chick embryo. 1-day culture. Mitochondria, 
threads, rods, granules; few neutral red granules. Janus green, neutral red, 
jodine. X 1450. 
14and15 Culture 717 (same culture as fig. 11). Endothelial cells from liver, 
8-day chick embryo; 6-day culture; pH 7.4 Variations in shape of cells and 
arrangement of mitochondria. Janusgreen,iodine. X 1450. 
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