  Amino acids are considered to be prime ingredients in chemistry, leading to
life. Glycine is the simplest amino acid and most commonly found in animal
proteins. It is a glucogenic and non-essential amino acid that is produced
naturally by living bodies and plays a key role in the creation of several
other important bio-compounds and proteins. We report the first spectroscopic
detection of the rotational absorption lines of the simplest amino acid glycine
(NH$_{2}$CH$_{2}$COOH) with confirmer I and II in the atmosphere of Venus using
the archival data from the Atacama Large Millimeter/Submillimeter Array (ALMA).
We detect the eleven rotational absorption lines of NH$_{2}$CH$_{2}$COOH
between the frequency range of $\nu$ = 245$-$262 GHz with $\geq$3$\sigma$
statistical significance. We calculate the total column density of glycine in
the atmosphere of Venus is $N$(NH$_{2}$CH$_{2}$COOH) $\sim$ 5$\times$10$^{14}$
cm$^{-2}$. Using the column density information of glycine, we calculate the
abundance of glycine is $\sim$ 1.6$\times$10$^{-9}$ in the atmosphere of Venus.
The detection of glycine in the atmosphere of Venus might be one of the keys to
an understanding of the formation mechanisms of prebiotic molecules in the
atmosphere of Venus. The detection of glycine indicates that the upper
atmosphere of Venus may be going through nearly the same biological method as
Earth billions of years ago.
