112 The Nature of Biological Diversity 



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FIG. 8. Photograph of zymograms of lactate dehydrogenase isozymes from eight 

 tissues of the mouse. Five isozymes are evident, most of which are found in most 

 tissues. However, the relative concentration of the various isozymes differs markedly 

 in the various tissues. 



ISOZYMES 



HEART LACTATE DEHYDROGENASE 



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FIG. 9. Diagrammatic representation of zymograms of lactate dehydrogenase iso- 

 zymes obtained from heart muscle of four species. Each species exhibits a charac- 

 teristic pattern of isozymes. 





