Jack and Jill (nursery rhyme) these stanzas were viewed as quatrains with internal rhymes, this would be an example of ballad form, a common form for nursery rhymes. The melody commonly associated with the rhyme was first recorded by the composer and nursery rhyme collector James William Elliott in his "National Nursery Rhymes and Nursery Songs" (1870). The Roud Folk Song Index, which catalogues folk songs and their variations by number, classifies the song as 10266. The phrase "Jack and Jill" was in use in England as early as the 16th century to indicate a boy and a girl. A comedy with the title "Jack
L-methionine (S)-S-oxide reductase participates in methionine metabolism. L-methionine (S)-S-oxide reductase In enzymology, a L-methionine (S)-S-oxide reductase () is an enzyme that catalyzes the chemical reaction The 3 substrates of this enzyme are L-methionine, thioredoxin disulfide, and HO, whereas its two products are L-methionine (S)-S-oxide and thioredoxin. This enzyme belongs to the family of oxidoreductases, specifically those acting on a sulfur group of donors with a disulfide as acceptor. The systematic name of this enzyme class is L-methionine:thioredoxin-disulfide S-oxidoreductase. Other names in common use include fSMsr, methyl sulfoxide reductase I and II, acetylmethionine sulfoxide reductase, methionine sulfoxide reductase, L-methionine:oxidized-thioredoxin S-oxidoreductase, methionine-S-oxide reductase, and free-methionine