<s>
In	O
biochemistry	O
,	O
a	O
Janin	B-Application
plot	I-Application
,	O
like	O
a	O
Ramachandran	B-Application
plot	I-Application
,	O
is	O
a	O
way	O
to	O
visualize	O
dihedral	O
angle	O
distributions	O
in	O
protein	O
structures	O
.	O
</s>
<s>
While	O
a	O
Ramachandran	B-Application
plot	I-Application
relates	O
the	O
two	O
backbone	O
dihedral	O
angles	O
,	O
a	O
Janin	B-Application
plot	I-Application
relates	O
the	O
first	O
side	O
chain	O
dihedral	O
angle	O
χ-1	O
against	O
χ-2	O
.	O
</s>
<s>
Because	O
not	O
all	O
amino	O
acids	O
have	O
these	O
dihedral	O
angles	O
,	O
a	O
Janin	B-Application
plot	I-Application
is	O
not	O
applicable	O
to	O
all	O
such	O
acids	O
.	O
</s>
