, these conserved sequence is estimated. Namely, DSL sequence corresponds to 00 amino acids residue from No. 000 cysteine to No. 000 cysteine of the amino acid sequence in the sequence listing, SEQ ID NO: 0. EGF-like sequence exists with 0 repeats wherein, in the amino acid sequence in the sequence listing, SEQ ID NO: 0, the first EGF-like sequence from No. 000 cysteine to No. 000 cysteine; the second EGF-like sequence from No. 000 cysteine to No. 000 cysteine; the third EGF-like sequence from No. 000 cysteine to No. 000 cysteine; the fourth EGF-like sequence from No. 000 cysteine to No. 000 cysteine; the fifth EGF-like sequence from No. 000 cysteine to No. 000 cysteine; the sixth EGF-like sequence from No. 000 cysteine to No. 000 cysteine; the seventh EGF-like sequence from No. 000 cysteine to No. 000 cysteine; and the eighth EGF-like sequence from No. 000 cysteine to No. 000 cysteine. A part of sugar chain attached is estimated from amino acid 