Disclosed are a conotoxin polypeptide -CPTx-bt102, a method for preparation thereof, and an application thereof. The conotoxin polypeptide of the present invention consists of 15 amino acids, has a molecular weight of 1660.61 daltons, and has the full sequence RCRCEQTCGTCVPCC (SEQ. ID NO. 1).

Disclosed are a conotoxin polypeptide -CPTx-bt105, a method for preparation thereof, and an application thereof. The conotoxin polypeptide of the present invention consists of 16 amino acids, has a molecular weight of 1626.62 daltons, and has the full sequence GICCVDDTCTTHSGCL (SEQ. ID NO. 1).

The present invention relates to an oral universal influenza vaccine comprising recombinant lactic acid bacteria which express proteins including but not limited to ferritin protein plus highly-conserved stem fragment of hemagglutinin (HA) proteins expressed in all known influenza viruses. The present invention also relates to the recombinant protein comprising the highly-conserved stem fragment of HA and ferritin proteins.

The present disclosure relates to methods and compositions comprising naturally occurring light absorbing molecules for preventing damages from light exposure. Specific embodiments of this disclosure include fluorescent proteins from Brachiostoma lanceolatum.

A voltage indicator includes a polypeptide sequence comprising a voltage-sensitive opsin domain and a capture protein domain arranged and disposed to capture a fluorescent dye ligand. When the fluorescent dye ligand is captured and the voltage indicator is bound to a cell membrane, an increase in voltage across the cell membrane causes an increase in fluorescent emission.

Conjugates comprising a targeting moiety specific for the CXCR4 and based on the polyphemusin-derived peptide and a therapeutic or imaging agent are provided. Therapeutic and diagnostic methods with the conjugates which require specific targeting to CXCR4+ cells are provided as well.

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 provision of a biologically safe hemolymph sera, preferably hemocyanin, more preferably KLH (keyhole limpet hemocyanin). The hemocyanin is purified using anion exchange chromatography.

Disclosed are compositions and methods for expressing and purifying a peptide of interest using a Flagellar Type III secretion system. Disclosed are nucleic acid sequences that contain a FlgM nucleic acid sequence, a cleavage site, and a nucleic acid sequence of interest. Also disclosed are polypeptides that contain FlgM, a cleavage site and a peptide of interest. Methods of producing polypeptides that have FlgM, a cleavage site and a peptide of interest are provided.

A peptide derivative represented by Formula (I) or a pharmaceutically acceptable salt thereof: ##STR00001##
wherein X represents an oxygen atom or NR, Y represents NH.sub.2, N(Me)H, SH, OH, or phenyl in which any one of hydrogen atoms is replaced by NH.sub.2 or OH, and R represents a hydrogen atom or C.sub.1-C.sub.3 alkyl, provided that the derivative where X is NH, and Y is NH.sub.2, and the derivative where X is NH, and Y is N(Me)H are excluded.