This digital resource is the reference guide for Agilent's Feature Extraction Software version 11.5. Agilent Feature Extraction (FE) Software is a critical bioinformatics tool used for processing and analyzing raw image data generated from Agilent microarrays. It converts scanned microarray images into quantitative gene expression data. The reference guide provides comprehensive documentation on the software's functionalities, algorithms, and parameters. It details how the software performs image analysis, including gridding, feature identification, background subtraction, and signal quantification. Users can find information on various extraction protocols, quality control metrics, and data normalization methods supported by the software. Version 11.5 indicates specific features and improvements relevant to that release. This software is indispensable for researchers working with Agilent microarray data, enabling them to extract meaningful biological information from their experiments. The guide helps users understand the nuances of data processing, optimize settings for different microarray types (e.g., gene expression, CGH), and interpret the output files. Proper use of the software is crucial for the accuracy and reliability of microarray results. As a proprietary software product from Agilent, the reference guide is a key piece of documentation for its users. It ensures that researchers can effectively utilize the software's capabilities for robust microarray data analysis, contributing to high-quality genomic research.