diff --git a/reject.txt b/reject.txt
index c90fb0a1f3aff22fa798bd8f7c0d0313b267f5e6..d658cfd70a617049f2544828ad4049e440f1c555 100644
--- a/reject.txt
+++ b/reject.txt
@@ -1,6 +1,8 @@
 ### only symbols
 [ -@]+
 
+### Single character
+.
 
 ### countries
 Argentina
@@ -19,7 +21,6 @@ USA
 
 
 ### Common English words
-A
 AD
 AH
 Album
@@ -42,7 +43,6 @@ Gas
 Hero
 Hi
 HI
-I
 Idea
 IE
 Lap
@@ -66,7 +66,6 @@ TeSt
 This
 unknown
 white
-C
 
 
 ### Excluded nodes
@@ -145,6 +144,7 @@ Arca
 Thymus
 phototrophic bacterium
 ncbi:55087	Bacillus
+ncbi:1869227	bacterium
 Laser
 Codon
 Dina
@@ -228,7 +228,9 @@ Zn2
 H-2
 PAR
 Mol
-
+O2
+O3
+Ala
 
 ### Obsolete
 # Be	ncbi:1587