“I propose the term exogenic fulgurites to distinguish this class from subterranean varieties.”

“Some external black glass is noted where the tubes may have been exposed subaerially during formation, but no exogenic specimens were noted.”

“They're something other than just craters and surface features which are formed by exogenic processes.”

“Because the rates of both endogenetic and exogenetic energy input vary, the coordinate agencies experience changes analogous to power surges in an electrical system.”

“These immune complexes can also be formed by external allergens on body surfaces such as the lungs, and lead to the clinical picture of exogenetic allergic alveolitis.”

“The particles of clastic material transported from land to the sea which are exogenetic.”

“These populations do not have the ability to utilize exogenous bicarbonate for the process of photosynthesis.”

“The by-products of exogenous citicoline formed by hydrolysis in the intestinal wall are choline and cytidine.”

“Endogenous retroviruses are the proviral form of exogenous retroviruses that have become integrated into the germ line of the host.”