American Peptide Co. Inc.
Solid or solution phase synthesis and purification of custom peptide, building blocks peptides for research and clinical practices or GMP. Alphabetical catalogue of peptides and synthesis reagents from Sunnyvale, California.
http://www.americanpeptide.com/

Signal peptide
Wikipedia article: short peptide sequences that direct the post-translational transport of proteins after synthesis.
http://en.wikipedia.org/wiki/Signal_peptide

C S Bio Co.
Supplier of peptide synthesizers and custom peptide synthesis.
http://www.csbio.com

Link Technologies, Ltd.
Link Technologies is a leading manufacturer of reagents (DNA, RNA, LNA and PNA) for oligonucleotide synthesis and modification. Our products include phosphoramidites, CPG, and custom synthesis. We also develop products in areas such as diagnostics and microarrays.
http://www.linktech.co.uk/

ShineGene Bio-Technologies
Gene Synthesis-First time order,ONLY EUR0.40/bp!Peptide Synthesis as Low as EUR3.81/AA!!-Gene Synthesis-Peptide Synthesis Professor!
http://www.synthesisgene.com

Protein and Peptide Letters
The journal for expert short papers in protein and peptide science.
http://www.bentham.org/ppl/

Peptide Protein Research Ltd.
Custom synthesis of synthetic peptides and peptide based molecules. Confidential and efficient service at competitive prices. Peptide modifications, specialist expertise, wide range of purities and quantities...
http://www.peptidesynthetics.co.uk/

Daniels Fine Chemicals Ltd.
Daniels Fine Chemicals Ltd. is a company specializing in custom peptide synthesis, specialty amino acids and custom organic intermediate synthesis. DFC also has a full line of fine organic chemicals.
http://www.dfccan.com/

Protein and Nucleic Acid Core Facility
We offer protein sequencing, amino acid analysis, peptide synthesis, HPLC, and gel electrophoresis.
http://www.biochem.mcw.edu/protein_facility/

Protein Facility of the Iowa State University
The Protein Facility of the Iowa State University Office of Biotechnology is open to faculty and students from the university, other educational institutions, and industry scientists. The facility offers protein/peptide sequencing, large and small scale peptide synthesis (Fmoc), matrix-assisted laser desorption/ionization (MALDI) mass spectrometry, circular dichroism, SDS-PAGE/blotting, 2-D gel electrophoresis, isoelectric focusing (IEF), in-gel digestion/peptide mass fingerprinting, digital image acquisition and analysis using the Typhoon imaging system and the 2D gel documentation/analysis system, and preparative, analytical and micro-analytical high performance liquid chromatography (HPLC)
http://www.protein.iastate.edu/