Sentence:  These <WSD>are</WSD> few and seemingly disjointed data , but they illustrate the important fact that fundamental alterations in conditioned reactions occur in a variety of states in which the hypothalamic balance has been altered by physiological experimentation , pharmacological action , or clinical processes . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)