1. Hierachical Database or family tree + mother father Child 1 Child 2 Child 11 Child 12 Child 21 Child 121 Child 122 Child 211

2. Relational Database System father 1 mother 1 father 2 mother 2 father 3 mother 3 father 4 mother 4 etc. Child 1 Child 2 Child 3 Child 4 Child 5 etc. Child 12 1 1 2 2 2 1 1 12 1 4 2 8 3 4 5 12 etc. 1 2 3 4 5 6 7 8 9 10 11 12 age

3. Relational Database WHAT IF Database ● Adding, deleting, modifying at runtime ● Unsorted ● Locking facility ● A lot of overhead ● Read only ● Sorted ● Not necessary ● Protein specific

4. SELECT SCAN3D DGLOOP SEARCH TABLE COLUMNS GROUPS ROWS TABLES handles protein in DB handles fragments in DB handles fragments/coordinates in DB handles protein in DB handles residues and atoms handles residues