Insulin-like peptide

A purified protein which comprises an amino acid sequence that is VGVWPTDCSHYAAEKAALQTYCN (SEQ. ID. NO.:11), AGVWPTDCSHYAAEKAALQTYCN (SEQ. ID. NO.:12), VGVWPTDCSHYACAEKAALQTYCN (SEQ. ID. NO.:13), VGVWPTDCSHYAAESAALQTYCN (SEQ. ID. NO.:14), VGVWPTDCSHYAAELAALQTYCN, (SEQ. ID. NO.:15), VGVWPTDCSHYAAEKAALQTYPN (SEQ. ID. NO.:16), AGVWPTDCSHYACAEKAALQTYCN (SEQ. ID. NO.:17), AGVWPTDCSHYAAESAALQTYCN (SEQ. ID. NO.:18), AGVWPTDCSHYAAELAALQTYCN (SEQ. ID. NO.:19), AGVWPTDCSHYAAEKAALQTYPN (SEQ. ID. NO.:20 ), VGVWPTDCSHYACAESAALQTYCN (SEQ. I.D. NO.:21), VGVWPTDCSHYACAELAALQTYCN (SEQ. ID. NO.:22), AGVWPTDCSHYACAESAALQTYCN (SEQ. ID. NO.:23), AGVWPTDCSHYACAELAALQTYCN (SEQ. ID. NO.:24), VGVWPTDCSHYACAEKAALQTYPN (SEQ. ID. NO.:25), AGVWPTDCSHYACAEKAALQTYPN (SEQ. ID. NO.:26), VGVWPTDCSHYACAESAALQTYPN (SEQ. ID. NO.:27), VGVWPTDCSHYACAELAALQTYPN (SEQ. ID. NO.:28), AGVWPTDCSHYACAESAALQTYPN (SEQ. ID. NO.:29), AGVWPTDCSHYACAELALQTYPN (SEQ. ID. NO.:30), VGVWPTDCSHYAAESAALQTYPN (SEQ. ID. NO.:31), VGVWPTDCSHYAAELAALQTYPN (SEQ. ID. NO.:32), AGVWPTDCSHYAAESAALQTYPN (SEQ. ID. NO.:33) or AGVWPTDCSHYAAELAALQTYPN (SEQ. ID. NO.:34), wherein said protein binds specifically to a yeast insulin-like protein receptor, which is isolated from a yeast culture, which has a molecular weight of 6400.+-.200 daltons, which upon binding to said yeast insulin-like protein receptor causes phosphorylation on a tyrosine residue of said yeast insulin-like protein receptor, and which elicits calcium mobilization upon binding to said insulin-like protein.