A GMO (genetically modified organism) is the result of a laboratory process of taking genes from one species and inserting them into another in an attempt to obtain a desired trait or characteristic, hence they are also known as transgenic organisms.
There are even simpler technology tools to use to map your professional network. For example, LinkedIn Inmaps will automatically create a color coded map of your network. You can spend time adding labels to specific clusters of your network to help with your analysis as I did.
You may see a notation in a job posting to provide professional references with your job application, or you may be asked for a list of references after you have interviewed with a company. A professional reference is a recommendation from a person who can vouch for your qualifications for a job.