![Spock donor](https://cdn.statically.io/img/static.wikia.nocookie.net/memoryalpha/images/6/63/Spock_donor.jpg/revision/latest/scale-to-width-down/180?cb=20160516190408&path-prefix=en)
Spock as a blood donor
A donor was anyone who provided biological matter, such as blood or an organ, to someone in need of it.
Cloning also involved someone being the donor of DNA to create a clone. A clone had DNA identical to the donor's, but certain cloning techniques caused a genetic degeneration, which could be detected. (DS9: "A Man Alone")
In 2268, Spock volunteered to be the blood donor for a blood transfusion to facilitate his father's heart surgery. (TOS: "Journey to Babel")
In 2366, Worf was the only suitable ribosome donor to save Patahk; Worf refused to donate and the Romulan ultimately died. (TNG: "The Enemy")
In 2371, The Doctor searched for compatible donors to give a Kazon a complete pyrocyte replacement. During the search for donors, it was discovered that Seska was not Bajoran, but Cardassian. (VOY: "State of Flux")
In 2373, Riley Frazier described the Borg Collective as thousands of donors simultaneously transferring neuro-electric energy to an injured Borg drone when necessary. (VOY: "Unity")
According to Doctor Crusher in 2379, the only way to save Shinzon would've been a complete DNA transfusion from the only compatible donor, Jean-Luc Picard. (Star Trek Nemesis)