Single Electron - Single Event
Single Exon - Single Fetus
Single Fibers - Single Genetic Locus
Single Genotype - Single Host Species
Single I.p. Injection - Single Injection
Single Insertion - Single Intravenous Dose

Single Intravenous Infusion - Single Leaf
Single Lesion - Single Markers
Single Market - Single Model
Single Molecule - Single Neurons
Single Nucleotide - Single Occasion
Single Operation - Single Pair
Single Parameter - Single Patient

Single Peak - Single Physician
Single Piles - Single Pot
Single Predictor - Single Progenitor Cell