Figure 4. The preferred volumes v_n (right) and flexibilities σ_n (left) of 28 ORs.

The error bars were calculated using the Jack-Knife method. Some ORs, including Or59b, Or67a and Or85a, preferred smaller molecules, but some ORs, including Or19a, Or1a and Or49a, preferred larger molecules. Some ORs, such as Or46a, Or22b and Or30a, were volume selective, but other ORs, including Or19a, Or67b and Or22a, responded to a broader range of molecular volumes. Asterisks indicate the updated results using the DoOR 2.0 database, and the numbers in parentheses show the percentage of DoOR 2.0 results relative to the total amount of data for each receptor.