Source databases:

UniProt Knowledgebase:
http://expasy.org/sprot/
 

NCBI:
http://www.ncbi.nlm.nih.gov/
 

NCBI, PubMed:
http://www.ncbi.nlm.nih.gov/sites/entrez/
 

Signal sequence prediction:

SignalP 3.0 Server:
http://www.cbs.dtu.dk/services/SignalP/
 

SignalP V2.0.b2:
http://www.cbs.dtu.dk/services/SignalP-2.0/
 

Phobius:
http://phobius.sbc.su.se/
 

PrediSi:
http://www.predisi.de/
 

SIGCLEAVE:
http://bioweb.pasteur.fr/seqanal/interfaces/sigcleave.html
 

SIGFIND - Signal Peptide Prediction Server:
http://139.91.72.10/sigfind/sigfind.html
 

SIG-Pred: Signal Peptide Prediction:
http://www.bioinformatics.leeds.ac.uk/prot_analysis/Signal.html
 

ANTHEPROT - Signal prediction:
http://antheprot-pbil.ibcp.fr/signal_prediction.html
 

SOSUIsignal:
http://bp.nuap.nagoya-u.ac.jp/sosui/sosuisignal/sosuisignal_submit.html
 

Signal Find Server:
http://signalfind.org/
 

SPD - Secreted Protein Database:
http://spd.cbi.pku.edu.cn/
 

SPEPlip:
http://gpcr.biocomp.unibo.it/cgi/predictors/spep/pred_spepcgi.cgi
 

Alignments:

ClustalW:
http://www.ebi.ac.uk/Tools/clustalw/index.html
 

http://npsa-pbil.ibcp.fr/cgi-bin/npsa_automat.pl?page=npsa_clustalw.html
 

http://align.genome.jp/
 

AliBee - Multiple Alignment:
http://www.genebee.msu.su/services/malign_reduced.html
 

Pairwise sequence Alignment:
http://genome.cs.mtu.edu/align/align.html
 

Align:
http://vega.igh.cnrs.fr/bin/align-guess.cgi
 

KALIGN:
http://msa.cgb.ki.se/cgi-bin/msa.cgi
 

CHAOS + DIALIGN:
http://dialign.gobics.de/chaos-dialign-submission
 

MULTALIN:
http://npsa-pbil.ibcp.fr/cgi-bin/npsa_automat.pl?page=npsa_multalin.html
 

BAliBASE:
http://bips.u-strasbg.fr/fr/Products/Databases/BAliBASE/
 

Further information on signal sequences:

SPdb: a signal peptide database:
http://proline.bic.nus.edu.sg/spdb/index.html
 

Further information on related topics:

a) Signal Recognition Particle

Signal Recognition Particle Database:
http://genome.ku.dk/resources/srpdb/
 

b) Protein Targeting/Protein Translocation

General Principles of Membrane Protein:
http://blanco.biomol.uci.edu/
 

ProteinTargeting and Translocation:
http://www.rockefeller.edu/pubinfo/proteintarget.html
 

TCDB Transport Classification Database:
http://www.tcdb.org/tcdb/
 

Direct Link:
http://www.tcdb.org/tcdb/tcfamilybrowse.php?tcname=3.A.5
 

c) FlyBase

FlyBase Database:
http://flybase.bio.indiana.edu/