Capon Capon A capon (from ) is a cockerel (rooster) that has been castrated to improve the quality of its flesh for food and, in some countries like Spain, fattened by forced feeding. In the United Kingdom, birds sold as capons are chemically or physically castrated cocks. The origins of caponised chickens are contested. They were known in ancient China as well as in ancient Greece and ancient Rome. An early record of caponisation is found under the Roman Republic: the Lex Faunia of 162 BC forbade fattening hens to conserve grain rations, so the Romans instead castrated roosters, which resulted
S-tag of the S-tag is: Lys-Glu-Thr-Ala-Ala-Ala-Lys-Phe-Glu-Arg-Gln-His-Met-Asp-Ser. It is believed that the peptide with its abundance of charged and polar residues could improve solubility of proteins it is attached to. Moreover, the peptide alone is thought not to fold into a distinct structure. On DNA-level the S-tag can be attached to the N- or C-terminus of any protein. After gene expression, such a tagged protein can be detected by commercially available antibodies. 1. R.T. Raines et al., The S-Tag Fusion System for Protein Purification. Methods Enzymol. 326, 362-367 (2000) S-tag S-tag is the name of an oligopeptide derived from pancreatic ribonuclease A