Gene expression profiling deals with the measuring of the activity of a large number of genes at once to estimate the cellular function. These profiles differentiate between cells that are actively dividing, or show how the cells react to a particular treatment.It measures the activity of identified target genes. Scholarly journal is a peer-reviewed journal in which scholarship relating to a particular academic discipline is published. Scholarly journals serve as forums for the introduction and presentation for scrutiny of new research, and the critique of existing research. Content typically takes the form of articles presenting original research, review articles, and book reviews. The term Scholarly journal applies to scholarly publications in all fields; this article discusses the aspects common to all academic field journals.