Some are kits, some are kits that are specially handbuilt, but many are factory preassembled. Available as a kit or preassembled unit, the Mk. Arduino boards are available commercially in preassembled form or as do-it-yourself (DIY) kits. The END DIOCS statement causes the assembly of IOCS unless a preassembled version is requested. ZDS's first computers were preassembled versions of Heathkit computers. Finished preassembled versions were also sold. Usually, genes migrate to preassembled factories for transcription. It is preassembled to the G heterotrimer through a polybasic c-terminal domain. Modern, preassembled balloons were being sold in the US by the early 20th century.