期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1974
卷号：71
期号：6
页码：2453-2455
DOI：10.1073/pnas.71.6.2453
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Whether the regulatory protein of an inducible operon for a catabolic pathway is a positive or a negative element in the control of expression is correlated with the frequent or infrequent presence, respectively, of the system's substrate in the natural environment.
关键词：positive compared to negative control ; host-parasite relations ; intestinal absorption ; evolution
