Patent ID: 8222479

Claim:
A non-human recombinant organism having any one of the following nucleic acids (i) to (iv) introduced therein: (i) a nucleic acid having the base sequence of SEQ ID NO:1; (ii) a nucleic acid encoding a protein having the amino acid sequence of SEQ ID NO:2; (iii) a nucleic acid with a base sequence identity of 90% or more to the nucleic acid sequence of clause (i); or (iv) a nucleic acid which encodes a dragline protein and hybridizes with the complementary chain of the nucleic acid of clause (i) under stringent conditions including hybridization in a buffer solution of 50% formamide, 1M NaCl, 1% SDS at 37° C. and washing with 0.1×SSC at 60° C.