An Unkindness of Ravens Fink. When Wexford does a favour for his wife—to look into the disappearance of one of their neighbours' husbands—everything he finds seems to confirm his first inkling: that this is simply another case of a bored middle-aged man having run off with a younger woman. However, when Rodney Williams is found dead, and another local man is stabbed in his car, Wexford finds himself thrown into an investigation involving a militant feministic organisation known as "Arria", who have taken the raven as their symbol. An Unkindness of Ravens An Unkindness of Ravens is a novel by British crime-writer Ruth Rendell.
Analyte-specific reagent specific reagent is the active ingredient of an in-house test. Analyte-specific reagent Analyte-specific reagents (ASRs) are a class of biological molecules which can be used to identify and measure the amount of an individual chemical substance in biological specimens. The U.S. Food and Drug Administration (FDA) defines "analyte specific reagents" (ASRs) in "21 CFR 864.4020" as “antibodies, both polyclonal and monoclonal, specific receptor proteins, ligands, nucleic acid sequences, and similar reagents which, through specific binding or chemical reaction with substances in a specimen, are intended to use in a diagnostic application for identification and quantification of an individual chemical substance