Coordination of nutrient sensing, nutrient availability, and cell growth in rumen protozoa. -Chemotaxis toward glucose and xylose by mixed ruminal protozoa and dose-responsive insulin recovery from wortmannin inhibition by entodiniomorphid cultures. -Differential chemotaxis by entodiniomorphids and isotrichids toward peptides of bacterial, protozoal, and soy origin. -Differential chemotaxis by entodiniomorphids and isotrichids toward glucose after incubation with emulsified polyunsaturated fatty acids.