In silico PCR. These tools are used to optimize the design of primers for target DNA or cDNA sequences. Primer optimization has two goals: efficiency and selectivity. Efficiency involves taking into account such factors as GC-content, efficiency of binding, complementarity, secondary structure, and annealing and melting point (Tm). In silico PCR amplification. PCR may be simulated against up-to-date sequenced prokaryotic genomes. This service allows a maximum of 2 mismatches between primers and template, so the stringency of in silico PCR must be consider high. Experiments against user's sequences may be simulated, and downloadable PHP script is available at realtime-windowsserver.com FastPCR is an integrated tool for PCR primers or probe design, in silico PCR, oligonucleotide assembly and analyses, alignment and repeat searching The FastPCR software is an integrated tools environment that provides comprehensive and professional facilities for designing any kind of PCR primers for standard, long distance, inverse.