add example target illustration

app.py

@@ -69,7 +69,9 @@ def retrieval():
     with col1:
         ex_target = 'YTKMKTATNIYIFNLALADALATSTLPFQSVNYLMGTWPFGTILCKIVISIDYYNMFTSIFTLCTMSVDRYIAVCHPVKALDFRTPRNAKTVNVCNWI'
         sequence = st.text_input('Enter amino-acid sequence', value=ex_target, placeholder=ex_target)
-        if sequence == 'HXHVWPVQDAKARFSEFLDACITEGPQIVSRRGAEEAVLVPIGEWRRLQAAA': # or sequence == ex_target:
+        if sequence == ex_target:
+            st.image('figures/lenselink_ex_target.jpeg', use_column_width='always')
+        elif sequence == 'HXHVWPVQDAKARFSEFLDACITEGPQIVSRRGAEEAVLVPIGEWRRLQAAA': 
             st.image('figures/ex_protein.jpeg', use_column_width='always')
         elif sequence:
             st.error('Visualization coming soon...')