Protein having fermented milk drawing property improving effect, fermented milk using same, and method for producing same

And at least one type of protein selected from the group consisting of proteins (a) to (d) described below. (a) A protein comprising the amino acid sequence represented by SEQ ID NO: 1; (b) a protein which comprises an amino acid sequence obtained by substitution, deletion, insertion and/or addition of one or more amino acids other than tyrosine at position 40 in the amino acid sequence represented by SEQ ID NO: 1, and which has a fermented milk wiredrawing property improving effect; (c) a protein which is composed of an amino acid sequence having 80% or more identity with the amino acid sequence represented by SEQ ID NO: 1, in which the amino acid corresponding to position 40 of the amino acid sequence represented by SEQ ID NO: 1 is tyrosine, and which has a fermented milk wiredrawing improving effect; and (d) a protein which is composed of an amino acid sequence encoded by DNA hybridized with a complementary strand of DNA composed of the nucleotide sequence represented by SEQ ID NO: 2 under stringent condit