1. An isolated, protein comprising an N-terminal amino acid and a C-terminal amino acid, wherein the protein is selected from the group consisting of: (a) a protein with an N-terminal cysteine that is appended with at least one hydrophobic moiety; (b) a protein with an N-terminal amino acid that is not a cysteine appended with at least one hydrophobic moiety; and (c) a protein with at least one hydrophobic moiety substituted for the N-terminal amino acid, on condition that if isolated protein is hedgehog-polypeptide, hydrophobic moiety is not a palmitoil group on N-terminal polypeptide, and wherein the protein has an amino acid sequence which has at least 70% identity to any one of SEQ ID NO: 1-4, and wherein the protein is connected with patch-protein. 2. The protein of claim 1, wherein the hydrophobic moiety is a peptide comprising at least one hydrophobic amino acid. 3. The protein of claim 1, wherein the hydrophobic moiety is a lipid. 4. The protein of claim 1, wherein the protein further comprises a hydrophobic moiety substituted for, or appended to, the C-terminal amino acid. 5. The protein of claim 1, wherein the protein is an extracellular signaling protein. 6. The protein of claim 1, wherein the N-terminal amino acid is a functional derivative of a cysteine. 7. The protein of claim 1, wherein the protein is modified at both the N-terminal amino acid and the C-terminal amino acid. 8. The protein of claims 4 or 7, wherein the protein has a hydrophobic moiety substituted for, or appended to, at least one amino acid intermediate to the N-terminal and C-terminal amino acids. 9. The protein of claim 1, wherein the protein has a hydrophobic moiety substituted for, or appended to, at least one amino acid intermediate to the N-terminal and C-terminal amino acids. 10. The protein of claim 3, wherein the lipid moiety is a fatty acid selected from saturated and unsaturated fatty acids having between 2 and 24 carbon atoms. 11. The protein of claim 1, wherein the protein is a hedgehog protein obtainable from a vertebrate source. 12. The protein of claim 11, wherein the hedgehog is obtainable from a human or rat. 13. The protein of claim 11, wherein the vertebrate hedgehog is selected from the group consisting of Sonic, Indian, and Desert hedgehog. 14. The protein of claim 1, further comprising a vesicle in contact with the hydrophobic moiety. 15. The protein of claim 14, wherein the vesicle is selected from the group consisting of a cell membrane, a micelle, and a liposome. 16. The protein of claim 11, wherein the hedgehog protein has an amino acid sequence according to any one of SEQ ID NO: 1-4. 17. The protein of claim 13, wherein the hedgehog protein is missing between 1 and about 10 amino acids from the C-terminus thereof, when compared to a wild-type hedgehog protein. 18. The protein of claim 16, wherein the protein has at least 60% amino acid identity to Sonic, Indian or Desert hedgehog. 19. An isolated, protein of the form: A-Cys-[Sp]-B-[Sp]-X, wherein A is a hydrophobic moiety; Cys is a cysteine or functional equivalent thereof; [Sp] is an optional spacer peptide sequence; B is a protein comprising a plurality of amino acids and, optionally, another spacer peptide sequence; and X is optionally another hydrophobic moiety linked to an amino acid of protein B on condition that if isolated protein is natural fragment of hedgehog-polypeptide, hydrophobic moiety is not a palmitoil group on N-terminal polypeptide. 20. The isolated protein of claim 19, wherein the isolated protein is a hedgehog protein. 21. The isolated protein of claim 20, wherein, if X is present, then it is cholesterol. 22. The isolated protein of claim 19, wherein protein B is modified at least one other amino acid with at least one hydrophobic moiety. 23. The isolated protein of claim 19, wherein the A-Cys linkage is via an amino group of cysteine. 24. The isolated protein of claim 19, further comprising a vesicle in contact therewith. 25. The isolated protein of claim 24, wherein the vesicle in contact therewith is selected from the group consisting of a cell membrane, micelle and liposome. 26. A vesicle to which is attached a plurality of molecules, at least two of the plurality having the form of claim 19. 27. The vesicle of claim 26, wherein the vesicle is selected from the group consisting of a cell membrane, liposome and micelle. 28. An isolated protein, having a C-terminal amino acid and an N-terminal thioproline group, said group formed by reacting an aldehyde with an N-terminal cysteine of the protein, wherein said protein comprises amino acid sequence, which has at least 70% identity to any one of SEQ ID NO: 1-4, and wherein the protein is connected with patch-protein. 29. An isolated, protein having a C-terminal amino acid and an N-terminal amide group, said group formed by reacting a fatty acid thioester with an N-terminal cysteine of the protein wherein said protein comprises amino acid sequence, which has at least 70% identity to any one of SEQ ID NO: 1-4, and wherein the protein is connected with patch-protein. 30. An isolated, protein having a C-terminal amino acid and an N-terminal maleimide group, said N-terminal maleimide group formed reacting a maleimide group with the N-terminal cysteine of the protein wherein said protein comprises amino acid sequence, which has at least 70% identity to any one of SEQ ID NO: 1-4, and wherein the protein is connected with patch-protein. 31. The isolated protein of claims 28, 29 or 30, wherein the C-terminal amino acid of the protein is modified with an hydrophobic moiety. 32. The isolated protein of claim 31, wherein the protein is a hedgehog protein. 33. The isolated protein of claim 32, wherein the C-terminal hydrophobic moiety is cholesterol. 34. A method of generating a multivalent protein complex comprising the step of linking, in the presence of a vesicle, a hydrophobic moiety to an N-terminal cysteine of a protein, or a functional equivalent of the N-terminal cysteine, wherein said protein comprises amino acid sequence, which has at least 70% identity to any one of SEQ ID NO: 1-4, and wherein the protein is connected with patch-protein. 35. The method of claim 34, wherein the step of linking comprises linking a lipid moiety which is selected from saturated and unsaturated fatty acids having between 2 and 24 carbon atoms. 36. The method of claim 34, wherein the protein has an amino acid sequence according to any one of SEQ ID NOS: 1-4. 37. The method of claim 34, wherein the hedgehog is selected from the group consisting of Sonic, Indian and Desert hedgehog. 38. The method of claim 34, wherein the step of linking comprises linking with a vesicle selected from the group consisting of a cell membrane, liposome and micelle. 39. A method for modifying a physico-chemical property of a protein, comprising introducing at least one hydrophobic moiety to an N-terminal cysteine of the protein or to a functional equivalent of the N-terminal cysteine, wherein said protein comprises amino acid sequence, which has at least 70% identity to any one of SEQ ID NO: 1-4, and wherein the protein is connected with patch-protein. 40. The method of claim 39, further comprising contacting the hydrophobic moiety with a vesicle. 41. The method of claim 39, wherein the hydrophobic moiety is either a lipid moiety selected from saturated and an unsaturated fatty acids having between 2 and 24 carbon atoms or is a hydrophobic protein. 42. The method of claim 39, wherein the protein has an amino acid sequence according to any one of SEQ ID NO: 1-4. 43. The method of claim 40, wherein the hedgehog protein is selected from the group consisting of Sonic, Indian and Desert hedgehog. 44. The method of claim 40, wherein the hedgehog has an amino acid sequence according to any one of SEQ ID NO: 1-4. 45. A protein complex, produced by the method of claim 34. 46. A modified protein, produced by the method of claim 39. 47. A method for modifying a protein, having a biological activity and containing an N-terminal cysteine, comprising reacting the N-terminal cysteine with a fatty acid thioester to form an amide, wherein such modification enhances the protein's biological activity, wherein said protein comprises amino acid sequence, which has at least 70% identity to any one of SEQ ID NO: 1-4, and wherein the protein is connected with patch-protein. 48. The method of claim 47, wherein the protein has an amino acid sequence according to any one of SEQ ID NO: 1-4. 49. The method of claim 48, wherein the hedgehog protein is selected from the group consisting of Sonic, Indian and Desert hedgehog. 50. A method for modifying a protein having a biological activity and containing an N-terminal cysteine, comprising reacting the N-terminal cysteine with a fatty acid thioester to form an amide, wherein such modification enhances the protein's biological activity, wherein said protein comprises amino acid sequence, which has at least 70% identity to any one of SEQ ID NO: 1-4, and wherein the protein is connected with patch-protein. 51. The method of claim 50, wherein the protein has an amino acid sequence according to any one of SEQ ID NO: 1-4. 52. The method of claim 51, wherein the hedgehog protein is selected from the group consisting of Sonic, Indian, Desert hedgehog, and functional variants thereof. 53. A method for modifying a protein having a biological activity and containing an N-terminal cysteine, comprising reacting the N-terminal cysteine with a maleimide group, wherein such modification enhances the protein's biological activity, wherein said protein comprises amino acid sequence, which has at least 70% identity to any one of SEQ ID NO: 1-4, and wherein the protein is connected with patch-protein. 54. The method of claim 53, wherein the hydrophobic peptide is appended to an amino acid of the protein selected from the group consisting of the N-terminal amino acid, the C-terminal amino acid, an amino acid intermediate between t