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| S Phase (1) | Saccharomyces cerevisiae (2) | Sacrococcygeal Region (1) |
| Safety (1) | Saliva (1) | Salivary Glands (1) |
| Salmon (1) | Salmonella Infections, Animal (1) | Salmonella typhimurium (1) |
| Sarcocystis (6) | Sarcocystosis (5) | Sarcoma (3) |
| Schistosoma (3) | Schistosoma mansoni (6) | Schistosomiasis (3) |
| Schistosomiasis mansoni (5) | Schwann Cells (1) | Scrotum (1) |
| Sea Lions (1) | Seals, Earless (1) | Seasons (11) |
| Seawater (2) | Secretory Rate (1) | Selection, Genetic (3) |
| Selenium (6) | Selenium Compounds (2) | Semen (1) |
| Senecio (2) | Sensation (1) | Sensitivity and Specificity (22) |
| Sentinel Surveillance (3) | Sepharose (1) | Sequence Alignment (10) |
| Sequence Analysis (1) | Sequence Analysis, DNA (18) | Sequence Analysis, Protein (3) |
| Sequence Deletion (4) | Sequence Homology, Amino Acid (13) | Sequence Homology, Nucleic Acid (3) |
| Serine Endopeptidases (1) | Serine Proteinase Inhibitors (1) | Seroepidemiologic Studies (8) |
| Serotyping (2) | Serpins (1) | Serum Albumin (3) |
| Serum Globulins (1) | Severity of Illness Index (6) | Sex Characteristics (2) |
| Sex Distribution (2) | Sex Factors (8) | Sex Ratio (1) |
| Sexual Behavior, Animal (3) | Sexually Transmitted Diseases (1) | Sheep (25) |
| Sheep Diseases (6) | Sheep, Domestic (1) | Shellfish (1) |
| Shigella (1) | Shock, Septic (1) | Sigmodontinae (1) |
| Signal Transduction (15) | Silage (2) | Silver (1) |
| Silver Nitrate (1) | Silver Staining (3) | Simplexvirus (2) |
| Single-Blind Method (1) | Skin (5) | Skin Diseases (3) |
| Skin Neoplasms (11) | Skull (1) | Skull Fractures (2) |
| Sleep (1) | Snails (3) | Social Behavior (1) |
| Social Support (1) | Societies, Scientific (1) | Sodium (14) |
| Sodium Bicarbonate (2) | Sodium Channels (3) | Sodium Chloride (1) |
| Sodium Selenite (2) | Sodium-Hydrogen Antiporter (2) | Sodium-Potassium-Exchanging ATPase (2) |
| Soft Tissue Neoplasms (2) | Soil Pollutants (1) | Solubility (2) |
| Sonication (1) | South Africa (5) | Soy Foods (1) |
| Soybeans (1) | Space Perception (4) | Spain (1) |
| Spatial Behavior (2) | Specialization (1) | Species Specificity (27) |
| Specific Gravity (2) | Specific Pathogen-Free Organisms (2) | Specimen Handling (1) |
| Spectrometry, Mass, Electrospray Ionization (1) | Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization (1) | Spectrophotometry, Ultraviolet (1) |
| Sperm Capacitation (1) | Sperm Count (1) | Sphenoid Bone (1) |
| Sphingolipids (2) | Sphingomyelins (2) | Spinacia oleracea (1) |
| Spinal Cord (7) | Spinal Cord Compression (3) | Spinal Cord Diseases (2) |
| Spinal Cord Injuries (2) | Spinal Diseases (1) | Spinal Nerves (1) |
| Spinal Osteophytosis (1) | Spine (1) | Spleen (6) |
| Splenectomy (1) | Splenic Neoplasms (2) | Spores, Bacterial (28) |
| Spores, Fungal (2) | Sports (3) | Staining and Labeling (2) |
| Staphylococcal Infections (2) | Staphylococcus (1) | Staphylococcus aureus (1) |
| Staphylococcus epidermidis (1) | STAT1 Transcription Factor (1) | STAT3 Transcription Factor (1) |
| Statistics, Nonparametric (5) | Stearates (1) | Stem Cell Factor (2) |
| Stereoisomerism (1) | Sterilization, Reproductive (1) | Sternum (1) |
| Steroids (1) | Stifle (4) | Stomach (3) |
| Stomach Diseases (3) | Stomach Neoplasms (1) | Stomach Ulcer (1) |
| Stomach Volvulus (1) | Stomach, Ruminant (1) | Stomatitis (1) |
| Streptococcal Infections (2) | Streptococcus (1) | Streptococcus equi (2) |
| Stress, Mechanical (1) | Stress, Physiological (1) | Stroke Volume (3) |
| Structure-Activity Relationship (1) | Students (1) | Subcutaneous Emphysema (1) |
| Substance-Related Disorders (1) | Substrate Specificity (3) | Sucrose (1) |
| Sulfadiazine (1) | Sulfates (2) | Sulfhydryl Compounds (2) |
| Superoxides (1) | Suprachiasmatic Nucleus (1) | Surface-Active Agents (1) |
| Surgical Flaps (1) | Surgical Wound Dehiscence (1) | Surgical Wound Infection (1) |
| Survival Analysis (7) | Survival Rate (4) | Sus scrofa (1) |
| Suture Techniques (1) | Sutures (3) | Sweetening Agents (1) |
| Swine (13) | Swine Diseases (3) | Swine, Miniature (1) |
| Symbiosis (1) | Synaptic Membranes (1) | Synaptic Transmission (2) |
| Synaptophysin (1) | Synaptosomes (1) | Syndrome (5) |
| Synovial Fluid (3) | Synovial Membrane (2) | Synovitis (1) |
| Synteny (1) | Systole (3) | |
