The best replacement for protein synthesis is dna replication.

The best alternatives to protein synthesis are rated as following:
★★★★★  dna replication
★★★  translation
★  prokaryotes eukaryotes
★  dna synthesis
  gene expression

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Speaking about protein synthesis, one probably shouldn't forget about rna.

Other search terms related to protein synthesis and their ratings are:
★★★★★ rna
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protein synthesis
dna replication
translation