The first one or two pairs of legs differ from the remainder, and probably function as sensory organs.

These three pairs of otoliths in teleost fishes differ in form, function, size, shape, and ultrastructure.

Each pair differs from the other in size and design, so the six ships do not constitute a single ship-class by the common usage of the term.

The remaining pairs differ either in their set of associated GenBank sequences or in the way of sequence clustering.

The minimum Hamming distance between any two code words (the number of bits by which any pair of code words differs) is eight.

The pair differs from the typical group 1 ribozyme nucleophilic residue, the J8/7 region has been reduced.

Perhaps no pair of valence isomers differ more strongly in appearance than colourless naphthalene and the intensely violet azulene.

In the case of Ca the pair of states labeled 3d4s differ in the direction of the electron spin of the outermost electron.

Where a pair of dates differ, a large gap (more than one year) may indicate an interruption of composition or a revision of the musical number.

Each succeeding pair of leaves differs from the previous one in form, size, and relative unity of the leaves.