Abstract: An expression library comprising a repertoire of nucleic acid sequences each encoding at least part of a variable domain of a heavy chain derived from an immunoglobulin naturally devoid of light chains and its use in producing antibodies, particularly fragments thereof, is disclosed. The invention provides a method for preparing antibodies, or fragments thereof, having a specificity for a target antigen which avoids the need for the donor previously to have been immunised with the target antigen.

Abstract: Use of a compound of formula (I) where R1 is a C4-6 alkylene linkage optionally substituted by a C1-4alkyl group; R2 is ?NH, —NH2 or —OH; R3 is C1-5 alkyl optionally terminated by a hydroxy, phenyl or a 5- or 6-membered heterocyclic group such as furyl or N-imidazolyl and R4 is H; or R3 and R4 together form a C3-5 alkylene linkage; to produce a topical refreshing or cooling sensation in a mammal such as a human.

Abstract: A bispecific or bivalent double head antibody fragment, which is composed of a binding complex containing two polypeptide chains, whereby one polypeptide chain has two times a variable domain of a heavy chain (V.sub.H) in series and the other polypeptide chain has two times a variable domain of a light chain (V.sub.L) in series, and the binding complex contains two pairs of variable domains (V.sub.H -A//V.sub.L -A and V.sub.H -B//V.sub.L -B), wherein said double head antibody fragments have binfunctional antigen binding activity. A process for producing such an antibody fragment is disclosed. An immunoassay is also provided for, wherein the improvement is the inclusion of a bispecific or bivalent double head antibody fragment, which is composed of a binding complex containing two polypeptide chains, whereby one polypeptide chain has two times a variable domain of a heavy chain (V.sub.H) in series and the other polypeptide chain has two times a variable domain of a light chain (V.sub.