Fig. 8.3 ©Scion Publishing Ltd

Fig. 8.4 ©Scion Publishing Ltd

Fig. 8.5 ©Scion Publishing Ltd

Fig. 8.6 ©Scion Publishing Ltd

Fig. 8.7 ©Scion Publishing Ltd

Fig. 8.9 ©Scion Publishing Ltd

Fig. 8.10 ©Scion Publishing Ltd

Fig. 8.11 ©Scion Publishing Ltd

Fig. 8.12 ©Scion Publishing Ltd

Fig. 8.13 ©Scion Publishing Ltd

Fig. 8.14 ©Scion Publishing Ltd

Fig. 8.15 ©Scion Publishing Ltd Redrawn from Immunobiology 5th edn with permission from Garland Science.

Fig. Box 8.2 ©Scion Publishing Ltd

Fig. Box 8.3 ©Scion Publishing Ltd