At the time this was regarded as a bold claim: biochemists were discovering more megalins[8] and the vagonics[9] that composed them all the time, not to mention the huge diversity of sugars.
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[9] Amino acids (the OTL term only dates from the end of the nineteenth century). Derived from the Greek word for train carriage, by the analogy that a megalin/protein made of a chain of vagonics/amino acids just as a train is of carriages.
Oops. "Greek word for train carriage"??? Clearly a borrowing from the German Wagon (or even the French, same word for that purpose). A sleeping car in French is "Wagonlit" (bed car).
Since train carriages are modern things, any 'Greek' word is a neologism.