A peptide comprising the sequence shown below is added as a peptide tag to a useful protein, followed by allowing its expression.

X.sub.m(PY.sub.n).sub.qPZ.sub.r

In this formula, X, Y, and Z each represent an amino acid residue independently selected from the group consisting of R, G, S, K, T, L, N, Q, and H, with the proviso that at least one Y represents K, L, N, Q, H, or R. m represents an integer of 0 to 5; n represents 1, 2, or 3; q represents an integer of 1 to 10; and r represents an integer of 0 to 10.

The present invention relates to the use of peptides, peptoids and/or peptidomimetics capable of self-assembling and forming a (nanofibrous) hydrogel in biofabrication. The present invention further relates to methods for preparing hydrogels and to methods for preparing continuous fibres and to methods for obtaining multi-cellular constructs with defined, precise geometrics. The present invention further relates to various uses of such hydrogels for obtaining mini-hydrogel arrays and 3D organoid structures or 3D macromolecular biological constructs.

Methods of preventing or reducing the incidence of acute urinary retention in mammals susceptible to developing acute urinary retention, and methods of reducing the incidence of clinically detected prostate cancer, using compositions containing compounds based on small peptides and a pharmaceutically acceptable carrier, are described. The methods include, but are not limited to, administering the compounds intramuscularly, orally, intravenously, intraprostatically, intrathecally, intratumorally, intranasally, topically, transdermally, etc., either alone or conjugated to a carrier to a mammal in need thereof.

Described is a dipeptide comprising a non-proteogenic amino acid, methods of making such and methods of using said dipeptide in a process of making a polypeptide or protein comprising one or more non-proteogenic amino acids.

Described is a dipeptide comprising a non-proteogenic amino acid, methods of making such and methods of using said dipeptide in a process of making a polypeptide or protein comprising one or more non-proteogenic amino acids.

Disclosed herein are isolated compositions including at least 2 of mutant peptides selected from the group consisting of SEQ ID NOS: 1-149, or polypeptides comprising the mutant peptides; wherein the composition comprises mutant peptides encoded by 2 or more genes. Also disclosed are methods for personalized treatment of breast cancer involving creating a peptide array of mutant peptides comprising the mutations in protein-encoding regions of the high-frequency cancer genes or the exome in a subject and screening the peptide array with a biological sample from the subject to detect antibodies in the biological sample that bind to the array, to detect antigenic targets for therapy in treating the subject.

The present disclosure relates to prodrugs of 7-chlorokynurenic acid. In certain embodiments, the prodrugs include those having the structure of any one of formula (I)-(VIII), wherein R.sup.1-R.sup.13, monomer 1, monomer 2, and linker are defined herein. Also provided are methods of preparing and using these prodrugs.

##STR00001## ##STR00002##

The present disclosure relates to prodrugs of 7-chlorokynurenic acid. In certain embodiments, the prodrugs include those having the structure of any one of formula (I)-(VIII), wherein R.sup.1-R.sup.13, monomer 1, monomer 2, and linker are defined herein. Also provided are methods of preparing and using these prodrugs.

##STR00001## ##STR00002##

In one aspect, the present disclosure relates to an imaging agent comprising a detectable moiety covalently bound or coordinated to a Moiety A selected from a peptide, a chelator, or an organic compound comprising a leaving atom or a leaving group that can be substituted with a radioisotope. Moiety A is covalently bound to a flexible linker which is further covalently bound to a polypeptide of between 2 and 20 glycine-proline-hydroxyproline repeats. In certain embodiments, the detectable moiety comprises a radioisotope or metal. In another aspect, the disclosure relates to a method of using the imaging agents of the present disclosure to detect collagen turnover in a subject.

In one aspect, the present disclosure relates to an imaging agent comprising a detectable moiety covalently bound or coordinated to a Moiety A selected from a peptide, a chelator, or an organic compound comprising a leaving atom or a leaving group that can be substituted with a radioisotope. Moiety A is covalently bound to a flexible linker which is further covalently bound to a polypeptide of between 2 and 20 glycine-proline-hydroxyproline repeats. In certain embodiments, the detectable moiety comprises a radioisotope or metal. In another aspect, the disclosure relates to a method of using the imaging agents of the present disclosure to detect collagen turnover in a subject.