166 



Inside the Living Cell 



HO 



-< ^ / ^^" ^ ^ CH2-CH-COQH 



NHo 



HO. 

 HO 



CH,OH 



I 1 



I. Thyroxin 



^ 



CH-CH,-NH-CH. 



OH 



!I. Adrenalin 



OH 



r 



Me 

 Me 



CO 



^ 



o^^y\/ 



111. Compound E or 

 Cortisone 



CH 



HoAyV 



IV, Estradiol 

 (Female sex hormone) 



Figure 7. Some of the hormones. 



.OH 



CH 



V. Testosterone 

 (Mo/e sex fiormonoj 



Polycydic hydrocarbons which occur in tars, such as benzpyrene. 

 Certain dyestuffs, such as 'butter yellow', and other azo-dyes. 



'Mustard gas' S(CH2.CH2.C1)2 and analogous compounds, 

 such as nitrogen 'mustards', e.g., CH3N(CH2.CH2.C1)2. 



/S-Naphthylamine and aminophenol, chemicals used in the dye- 

 stuffs industry. The latter is formed naturally in the human 

 bladder in some abnormal conditions and gives rise to bladder 



cancer. 



Plastic films of various materials, embedded under the skin. 

 Ionizing radiations from X-ray sets or from radioactive 



substances. 



Fig. 8. Some carcinogenic agents. 



