Several Metres - Several Modes
Several Modifications - Several Nests
Several Neurodegenerative Diseases - Several Nuclei
Several Numerical - Several Other Compounds
Several Other Countries - Several Paradigms
Several Parameters - Several Peptides

Several Perspectives - Several Plants
Several Points - Several Principles
Several Problems - Several Protein Structures
Several Proteins - Several Reports
Several Requirements - Several Scales
Several Scenarios - Several Significant Differences
Several Similarities - Several States

Several Steps - Several Syndromes
Several Systems - Several Themes
Several Theoretical - Several Tissues