Eye twitching, eyelid spasm and blepharospasm are terms used to refer to any of three separate conditions. They each have different causes, and one doesn't lead to the other. Eyelid twitching (myokymia) affects only the eyelid. It can involve either the upper or lower lid, but only one eye at a time. The eye twitching can range from barely noticeable to bothersome.
Recombinant DNA technology involves introducing genes from one organism into another organism. Scientists rely on this technology to produce the drug insulin, which people with diabetes need to manage their blood sugar levels. In the late 1970s, scientists figured out which human gene codes for the protein insulin. They were able to take the gene out of human DNA and insert it into a special type of bacterial DNA called a plasmid. Scientists then grew large cultures of the bacteria with the insulin gene, and the bacteria produced large quantities of insulin.
Recombinant DNA technology enables individual fragments of DNA from any genome to be inserted into vector DNA molecules, such as plasmids, and individually amplified in bacteria. Each amplified fragment is called a DNA clone.