Nodes	- Stores primary, connector and graph nodes
ID 	- Internal node ID [auto number]
URN	- Global node ID [string]
Node_Type- Node type ID (Protein, Cell Process, Binding, etc.) [number]
Node_Class- Node class ID (Node, Control) [number]
isDeleted	   - “true” if node has been deleted
DataSource- External database source name where the node comes from

Edges	- Stores links between nodes (primary, connector and graph nodes)
ID 	- Internal link ID [auto number]
IDSrc 	- Internal ID of the source node [number]
IDDst 	- Internal ID of the destination node [number]
Direction 	- Link class (directed, non-directed)
Relation	- Special relationship types(subgraph, member-of, ...)

Graph_Edges	- Stores information about graph edge membership, for performance
purposes, generally for graph nodes (complexes) searches
graph_ID	- Internal graph ID [auto number]
Edge_ID	- Link ID (from Edges table) [number]

Graph_Nodes - Stores information about graph node membership, for performance
purposes, generally for graph nodes (complexes) searches
graph_ID	- Internal graph ID [auto number]
Node_ID	- Node ID (from Node table) [number]

NodeType	- Stores node type information (Protein, Binding, etc.) as hierarchy
ID		- Node type ID [auto number]
Name		- Node type name [string]
child_of		- child of the node type in the node type hierarchy [number]
NodeType_SynonymsID- Node Type synonims ID [number]

NodeType_Synonyms - Stores information about Node Type synonyms
ID		- Node type synonym ID [auto number]
NodeType_Synonym - Node Type synonym [number]

Attributes	- Stores attributes associated with nodes
ID		- Internal attribute value ID [auto number]
NodeID		- ID of the corresponding Node [number]
Attribute_Type_ID	- Attribute type ID (Name, Organism, Effect, etc.) [number]
AttrOption	- Attribute option (multi-value, single value) [number]
DataType 	- Data type of attribute [string]

DoubleValue - Stores values for dictionary-based properties
ID	- Internal value ID [auto number]
Value	- Property value
NodeID	- Corresponding Node ID. For performance purposes only.
It reduces the number of joins, although the information is duplicated.

IntegerValue - Stores values for dictionary-based properties
ID	- Internal value ID [auto number]
Value	- Property value
NodeID	- Corresponding Node ID. For performance purposes only.
It reduces the number of joins, although the information is duplicated.

FloatValue - Stores values for dictionary-based properties
ID	- Internal value ID [auto number]
Value	- Property value
NodeID	- Corresponding Node ID. For performance purposes only.
It reduces the number of joins, although the information is duplicated.

StringValue	- Stores values for dictionary-based properties
ID	- Internal value ID [auto number]
Value	- Property value
NodeID	- Corresponding Node ID. For performance purposes only.
It reduces the number of joins, although the information is duplicated.

LongStingValue - Stores values for dictionary-based properties
ID	- Internal value ID [auto number]
Value	- Property value
NodeID	- Corresponding Node ID. For performance purposes only.
It reduces the number of joins, although the information is duplicated.

Attribute_Type	- Stores attribute type information (Name, Organism, Effect, etc.)
ID		- Attribute type ID [auto number]
AttributeName	- Attribute type name [string]

Attribute_Type_Category	- Stores attribute category hierarchy
ID		- Internal attribute category ID [auto number]
Attribute_Type_Name- Attribute type name
Relation		- Special relationship types (subgraph, member-of, ...)
child_of		- child of the node type in the attribute category hierarchy [number]

AT_NT	- Stores the attribute type and node type relationships, for performance purposes only
Attribute_Type	- Attribute type ID [number]
Node_Type	- Node Type ID [number]

Data_Source - Stores the information about different data sources
ID		- Internal Data Source ID [auto number]
IDName		- Data Source Name [string]
FullName		- Full name of data source [string]
Last_Depos_Time	- Last time data was deposited
Description	- Data source description [string]
Reference	- Reference to data source [string]
UserID		- Corresponding user's ID [number]

User	- Stores the information about different
        users, allowed to store, update or edit database information
ID	- Internal User ID [auto number]
Name	- User Name [string]
Institute	- User's institution name [string]
email	- User's e-mail [string]