There is provided an elongation method of an optical fiber base material, by which a base material rod not requiring a process for modifying a bend from base material ingot is obtained. A first electrode is formed on the first substrate, and a second electrode is formed on the second substrate. By the blue light emitted from the blue light-emitting crystal, the fluorescent powder of the frame body may be excited to emit uniform yellow light, which may be further mixed with the blue light to become white light. The vector includes a nucleic acid sequence encoding a detectable selection marker which is controlled by a promoter that is active in host cells used to screen for recombinant virus but is silent in the non-permissive cell used for expression of the exogenous target protein. For example, each of the DNS queries may request an A record or an AAAA record.