diff --git a/public/scripts/library/rdp/wip_rdp_abstract_sequence.js b/public/scripts/library/rdp/wip_rdp_abstract_sequence.js
index e2a5c908..d572a0bd 100644
--- a/public/scripts/library/rdp/wip_rdp_abstract_sequence.js
+++ b/public/scripts/library/rdp/wip_rdp_abstract_sequence.js
@@ -6,16 +6,16 @@ import RdpEdit from './rdp_edit';
 
 
 class WipRdpAbstractSequence extends Sequence {
-  constructor(attributes, ...other) {
-    if(!attributes.Klass) throw new TypeError('Must provide Klass attribute');
-    if(!attributes.types) throw new TypeError('Must provide types attribute');
-    var Klass = attributes.Klass;
-    var types = _.clone(attributes.types);
-    delete attributes.Klass;
-    delete attributes.types;
+  constructor(attributes, options={}) {
+    if(!options.Klass) throw new TypeError('Must provide Klass attribute');
+    if(!options.types) throw new TypeError('Must provide types attribute');
+    var Klass = options.Klass;
+    var types = _.clone(options.types);
+    delete options.Klass;
+    delete options.types;
 
     attributes.readOnly = true;
-    super(attributes, ...other);
+    super(attributes, options);
     this.Klass = Klass;
     this.types = types;
 
diff --git a/public/scripts/library/rdp/wip_rdp_oligo_sequence.js b/public/scripts/library/rdp/wip_rdp_oligo_sequence.js
index 341439d7..3306a5e4 100644
--- a/public/scripts/library/rdp/wip_rdp_oligo_sequence.js
+++ b/public/scripts/library/rdp/wip_rdp_oligo_sequence.js
@@ -9,13 +9,10 @@ var wip_rdp_oligo_sequence = 'wip_rdp_oligo_sequence';
 
 
 class WipRdpOligoSequence extends WipRdpAbstractSequence {
-  constructor(attrs, ...args) {
-    if(attrs._type && attrs._type !== wip_rdp_oligo_sequence) {
-      throw new TypeError(`WipRdpPcrSequence expected _type of "${wip_rdp_oligo_sequence}" but was "${attrs._type}"`);
-    }
-    attrs.Klass = WipRdpOligoSequence;
-    attrs.types = RdpTypes.oligoTypes;
-    super(attrs, ...args);
+  constructor(attrs, options={}) {
+    options.Klass = WipRdpOligoSequence;
+    options.types = RdpTypes.oligoTypes;
+    super(attrs, options);
     this.set({_type: wip_rdp_oligo_sequence}, {silent: true});
   }
 
diff --git a/public/scripts/plugins/pcr/lib/wip_rdp_pcr_sequence.js b/public/scripts/plugins/pcr/lib/wip_rdp_pcr_sequence.js
index 956f59c9..afc8ce19 100644
--- a/public/scripts/plugins/pcr/lib/wip_rdp_pcr_sequence.js
+++ b/public/scripts/plugins/pcr/lib/wip_rdp_pcr_sequence.js
@@ -8,10 +8,10 @@ var wip_rdp_pcr_product = 'wip_rdp_pcr_product';
 
 
 class WipRdpPcrSequence extends WipRdpAbstractSequence {
-  constructor(attributes, ...other) {
-    attributes.Klass = WipRdpPcrSequence;
-    attributes.types = RdpTypes.pcrTypes;
-    super(attributes, ...other);
+  constructor(attributes, options={}) {
+    options.Klass = WipRdpPcrSequence;
+    options.types = RdpTypes.pcrTypes;
+    super(attributes, options);
     this.set({_type: wip_rdp_pcr_product}, {silent: true});
   }