MeSH definition : The apparent tendency of certain diseases to appear at earlier AGE OF ONSET and with
increasing severity in successive generations. (Rieger et al., Glossary of Genetics:
Classical and Molecular, 5th ed);
The apparent tendency of certain diseases to appear at earlier AGE OF ONSET and with
increasing severity in successive generations. (Rieger et al., Glossary of Genetics:
Classical and Molecular, 5th ed)