diff --git a/CHANGES.md b/CHANGES.md
index c31a100..ffe3873 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -9,6 +9,10 @@ and `Semantic versioning 2.0.0 <http://semver.org/>`\_, with the exceptions that
 - versions above `1.0.0` will be numbered as `major.minor.patch`, as is
   typical
 
+# Unreleased
+
+Add new query type `RNADiffusionMaskedQuery`
+
 # 0.6.0 (2024-12-17)
 
 - More constraints on Boltz
diff --git a/ginkgo_ai_client/queries.py b/ginkgo_ai_client/queries.py
index e89960a..93ffc80 100644
--- a/ginkgo_ai_client/queries.py
+++ b/ginkgo_ai_client/queries.py
@@ -464,12 +464,45 @@ class MultimodalDiffusionMaskedResponse(ResponseBase):
 class RNADiffusionMaskedQuery(QueryBase):
     """A query to perform masked sampling using a mRNA diffusion model.
 
+    Parameters
+    ----------
+    three_utr: str
+        The three UTR sequence, of the form "ATTG<mask>TAC..."
+    five_utr: str
+        The five UTR sequence, of the form "ATTG<mask>TAC..."
+    protein_sequence: str
+        The protein sequence, of the form "MLKKRRK...LP-" (the last character denotes a
+        stop codon).
+    species: str
+        The species, e.g. "HOMO_SAPIENS"
+    temperature: float, optional (default=1.0)
+        Sampling temperature, a value between 0 and 1.
+    decoding_order_strategy: str, optional (default="entropy")
+        Strategy for decoding order, must be either "max_prob" or "entropy".
+    unmaskings_per_step: int, optional (default=4)
+        Number of tokens to unmask per step
+    num_samples: int, optional (default=1)
+        Number of samples to generate
+    model: str
+        The model to use for the inference, "mrna-foundation" being the only choice
+        currently.
+    query_name: Optional[str] = None
+        The name of the query. It will appear in the API response and can be used to
+        handle exceptions.
+
+    Returns
+    -------
+    MultimodalDiffusionMaskedResponse
+        ``client.send_request(query)`` returns a ``MultimodalDiffusionMaskedResponse`` with
+        attributes ``samples`` (a list of predicted samples, with modality name: predicted sequence)
+        and ``query_name`` (the original query's name).
+
     Examples
     --------
     >>> query = RNADiffusionMaskedQuery(
     ...     three_utr="ATTG<mask>TAC",
     ...     five_utr="ATTG<mask>TAC",
-    ...     protein_sequence="ATTG<mask>TAC",
+    ...     protein_sequence="MLKKRRK",
     ...     species="HOMO_SAPIENS",
     ...     model="mrna-foundation",
     ...     temperature=1.0,
@@ -494,21 +527,19 @@ class RNADiffusionMaskedQuery(QueryBase):
     def to_request_params(self) -> Dict:
 
         data = {
-            "three_utr": self.three_utr.replace(
-                "<mask>", "[MASK]"
-            ),  # UTR tokenizers require [MASK] but api client accepts <mask> for consistence across models
-            "five_utr": self.five_utr.replace("<mask>", "[MASK]"),
+            "three_utr": self.three_utr,
+            "five_utr": self.five_utr,
             "sequence_aa": self.protein_sequence,
             "species": self.species,
             "temperature": self.temperature,
             "decoding_order_strategy": self.decoding_order_strategy,
-            "num_to_decode_per_step": self.unmaskings_per_step,
+            "unmaskings_per_step": self.unmaskings_per_step,
             "num_samples": self.num_samples,
         }
         return {
             "model": self.model,
             "text": json.dumps(data),
-            "transforms": [{"type": "GENERATE"}],
+            "transforms": [{"type": "MRNA_DIFFUSION_GENERATE"}],
         }
 
     def parse_response(self, results: Dict) -> MultimodalDiffusionMaskedResponse:
diff --git a/test/test_mrna_model.py b/test/test_mrna_model.py
index a2afcfd..5473e01 100644
--- a/test/test_mrna_model.py
+++ b/test/test_mrna_model.py
@@ -4,17 +4,19 @@
     GinkgoAIClient,
 )
 
+
 def test_get_mrna_species():
 
     species = RNADiffusionMaskedQuery.get_species_dataframe()
     assert len(species) == 324
 
+
 def test_mrna_diffusion():
     client = GinkgoAIClient()
-    three_utr="AAA<mask>TTTGGGCC<mask><mask>"
-    five_utr="AAA<mask>TTTGGGCC<mask><mask>"
-    protein_sequence="MAKS-" # '-' for end of sequence
-    species="HOMO_SAPIENS"
+    three_utr = "AAA<mask>TTTGGGCC<mask><mask>"
+    five_utr = "AAA<mask>TTTGGGCC<mask><mask>"
+    protein_sequence = "MAKS-"  # '-' for end of sequence
+    species = "HOMO_SAPIENS"
     num_samples = 3
     query = RNADiffusionMaskedQuery(
         three_utr=three_utr,
@@ -25,7 +27,7 @@ def test_mrna_diffusion():
         temperature=1.0,
         decoding_order_strategy="entropy",
         unmaskings_per_step=10,
-        num_samples=num_samples
+        num_samples=num_samples,
     )
 
     response = client.send_request(query)
@@ -39,10 +41,10 @@ def test_mrna_diffusion():
 
         # check codon sequence verbatim. +1 because of stop codon
         assert len(sample["codon_sequence"]) == len(protein_sequence) * 3
-        assert sample["codon_sequence"].startswith("ATG") # Start codon
-        assert sample["codon_sequence"][-3:] in ["TAA","TAG","TGA"] # stop codon
+        assert sample["codon_sequence"].startswith("ATG")  # Start codon
+        assert sample["codon_sequence"][-3:] in ["TAA", "TAG", "TGA"]  # stop codon
 
         # should translate
         translated = str(Seq(sample["codon_sequence"]).translate())
-        print(translated,  protein_sequence)
-        assert translated.replace("*","-") == protein_sequence
\ No newline at end of file
+        print(translated, protein_sequence)
+        assert translated.replace("*", "-") == protein_sequence