--- a
+++ b/src/dash/app.py
@@ -0,0 +1,80 @@
+import dash
+
+import dash_bootstrap_components as dbc
+external_stylesheets=[dbc.themes.BOOTSTRAP]
+
+# add GA script
+external_scripts = [
+    {'src':'/assets/gtag.js'},
+]
+
+app = dash.Dash(__name__,
+    suppress_callback_exceptions=True,
+    external_stylesheets=external_stylesheets,
+    external_scripts=external_scripts)
+
+app.title = 'COVID-19 Multi-Omics'
+
+server = app.server
+
+### load shared data ###
+from data import get_omics_data, get_biomolecule_names
+import datetime
+
+print()
+print(datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
+print("Loading data for app...")
+print()
+# load metabolomics data matrix
+print("Loading metabolomics data...")
+metabolomics_df, metabolomics_quant_range = get_omics_data(dataset='metabolomics', with_metadata=True)
+print("Metabolomics data shape: {}".format(metabolomics_df.shape))
+print("Loading lipidomics data...")
+lipidomics_df, lipidomics_quant_range = get_omics_data(dataset='lipidomics', with_metadata=True)
+print("Lipidomics data shape: {}".format(lipidomics_df.shape))
+print("Loading proteomics data...")
+proteomics_df, proteomics_quant_range = get_omics_data(dataset='proteomics', with_metadata=True)
+print("Proteomics data shape: {}".format(proteomics_df.shape))
+print("Loading transcriptomics data...")
+transcriptomics_df, transcriptomics_quant_range = get_omics_data(dataset='transcriptomics', with_metadata=True)
+print("Transcriptomics data shape: {}".format(transcriptomics_df.shape))
+
+# make biomolecule_name_dict
+metabolomics_biomolecule_names_dict = get_biomolecule_names(dataset='metabolomics')
+lipidomics_biomolecule_names_dict = get_biomolecule_names(dataset='lipidomics')
+proteomics_biomolecule_names_dict = get_biomolecule_names(dataset='proteomics')
+transcriptomics_biomolecule_names_dict = get_biomolecule_names(dataset='transcriptomics')
+
+# define dataset dictionaries
+dataset_dict = {
+        "Proteins":"proteomics",
+        "Lipids":"lipidomics",
+        "Metabolites":"metabolomics",
+        "Transcripts":"transcriptomics",
+        "Combined Biomolecules":"combined"
+    }
+
+df_dict = {
+    "proteomics":proteomics_df,
+    "lipidomics":lipidomics_df,
+    "metabolomics":metabolomics_df,
+    "transcriptomics":transcriptomics_df
+}
+
+quant_value_range_dict = {
+    "proteomics":proteomics_quant_range,
+    "lipidomics":lipidomics_quant_range,
+    "metabolomics":metabolomics_quant_range,
+    "transcriptomics":transcriptomics_quant_range
+}
+
+global_names_dict = {
+    "proteomics":proteomics_biomolecule_names_dict,
+    "lipidomics":lipidomics_biomolecule_names_dict,
+    "metabolomics":metabolomics_biomolecule_names_dict,
+    "transcriptomics":transcriptomics_biomolecule_names_dict,
+    "combined":{**proteomics_biomolecule_names_dict,
+                **lipidomics_biomolecule_names_dict,
+                **metabolomics_biomolecule_names_dict,
+               **transcriptomics_biomolecule_names_dict}
+}