An enzyme that phosphorylates (adds a phosphate group) to a substrate. The substrates for protein kinases are amino acids in other proteins, and they are divided into those specific for tyrosine and those specific for threonine/serine. Genes V, p.1245
Ribonucleic acid. Linear, generally single-stranded polymer, composed of ribose nucleotides, that is synthesized by transcription of DNA or by copying of RNA. The three types of cellular RNA – mRNA, rRNA, and tRNA – play different roles in protein synthesis.