diff --git a/MetaMorpheus/EngineLayer/Data/ptmlist.txt b/MetaMorpheus/EngineLayer/Data/ptmlist.txt
index b0492b35c..3d4b86d1b 100644
--- a/MetaMorpheus/EngineLayer/Data/ptmlist.txt
+++ b/MetaMorpheus/EngineLayer/Data/ptmlist.txt
@@ -1738,6 +1738,20 @@ TR   Eukaryota; taxId:9258 (Ornithorhynchus anatinus).
 DR   RESID; AA0515.
 DR   PSI-MOD; MOD:01618.
 //
+ID   Allysine
+AC   PTM-0059
+FT   MOD_RES
+TG   Lysine.
+PA   Amino acid side chain.
+PP   Anywhere.
+CF   H-3 N-1 O1
+MM   -1.031634
+MA   -1.03
+LC   Extracellular and lumenal localisation.
+TR   Eukaryota; taxId:6052 (Ephydatia muelleri), taxId:7742 (Vertebrata).
+DR   RESID; AA0121.
+DR   PSI-MOD; MOD:00130.
+//
 ID   Aminomalonic acid (Ser)
 AC   PTM-0321
 FT   MOD_RES
diff --git a/MetaMorpheus/EngineLayer/Mods/Mods.txt b/MetaMorpheus/EngineLayer/Mods/Mods.txt
index 1602366a9..875b0108d 100644
--- a/MetaMorpheus/EngineLayer/Mods/Mods.txt
+++ b/MetaMorpheus/EngineLayer/Mods/Mods.txt
@@ -89,14 +89,6 @@ NL   HCD:43.0058
 CF   H-1 N-1 O1
 DR   Unimod; 7.
 //
-ID   Allysine
-TG   K
-PA   Amino acid side chain.
-PP   Anywhere.
-MT   Common Biological
-CF   H-3 N-1 O1
-DR   Unimod; 352.
-//
 ID   HexNAc
 TG   Nxs or Nxt
 PP   Anywhere.
diff --git a/MetaMorpheus/GUI/Util/UpdateGUISettings.cs b/MetaMorpheus/GUI/Util/UpdateGUISettings.cs
index 68c9a0eab..b553e15ab 100644
--- a/MetaMorpheus/GUI/Util/UpdateGUISettings.cs
+++ b/MetaMorpheus/GUI/Util/UpdateGUISettings.cs
@@ -308,7 +308,6 @@ public static bool UseSpectralRecoveryMandatorySettings()
             ("Common Biological", "Sulfonation on Y"),
             ("Common Biological", "Trimethylation on K"),
             ("Common Biological", "Citrullination on R"),
-            ("Common Biological", "Allysine on K"),
             ("Common Biological", "HexNAc on Nxs"),
             ("Common Biological", "HexNAc on Nxt"),
             ("Common Biological", "HexNAc on S"),