RESEARCH BASE
Search 3,721 documents across 34 fields — every claim tier-rated by evidence
3,633 are the core, quality-scored corpus (34 lettered sections — see How We Work); the remaining 88 are cross-corpus synthesis documents (68 InterDocs, 12 Connections, 8 Theories) also indexed here.
2,646 results for "SI second" — page 73 of 133
Z_3_11 — Genetic Mosaicism and Chimerism
A fundamental assumption of genetics — that every cell in an individual's body carries the same genome — is wrong. Genetic mosaicism (the presence of two or more genetically distinct cell populations within an individual
Z_3_05 — Viral Integration and Endogenous Retroviruses
Approximately 8% of the human genome consists of human endogenous retroviruses (HERVs) — the remnants of ancient retroviral infections that integrated into germline cells and were subsequently inherited vertically like a
Z_3_01 — Genetics of Brain Development — ASPM, Microcephalin, HAR1
The human brain is approximately three times larger than expected for a primate of our body size, with a vastly expanded cerebral cortex containing ~86 billion neurons. Identifying the genetic basis for this extraordinar
Z_2_15 — Future of Genomics and Personalized Medicine
Genomics is undergoing a transition from research tool to clinical infrastructure. The cost of whole-genome sequencing (WGS) has plummeted from $2.7 billion (Human Genome Project, 1990–2003) to ~$200 per genome (Illumina
Z_2_13 — Pharmacogenomics and Personalized Medicine
Pharmacogenomics — the study of how genetic variation influences drug response — is among the most clinically actionable applications of human genetics. Adverse drug reactions (ADRs) are the 4th–6th leading cause of deat
Z_2_10 — Genetics of Aging and Progeria
Aging — the progressive decline in physiological function leading to increased vulnerability to disease and death — has a substantial genetic component: twin studies estimate heritability of human lifespan at ~25–30% (He
Z_2_08 — Prion Genetics and Misfolded Proteins
Prions are infectious agents composed entirely of misfolded protein — the only known pathogen that contains no nucleic acid (no DNA, no RNA). The protein-only hypothesis (Stanley Prusiner, 1982 — Nobel Prize 1997) states
Z_2_12 — Genetics of Pain Perception
Pain perception — the subjective experience triggered by actual or potential tissue damage — varies enormously across individuals, with genetic factors accounting for 25–50% of the variance in pain sensitivity (twin stud
Z_2_04 — Genetic Disorders and Inborn Errors of Metabolism
Genetic disorders — diseases caused by mutations in single genes (monogenic) or chromosomal abnormalities — affect ~3–5% of live births and collectively represent thousands of distinct conditions catalogued in the Online
Z_2_06 — Nutrigenomics and Diet-Gene Interactions
Nutrigenomics — the study of how genetic variation influences nutritional requirements, dietary responses, and disease susceptibility — and its complement nutrigenetics (how diet influences gene expression) represent a r
Z_2_14 — Genetics of Longevity and Blue Zones
The genetics of human longevity — why some individuals live past 100 while most do not — is a field where heritability is modest, effect sizes are small, and environmental factors dominate, yet several genetic pathways h
Z_2_05 — Gene Therapy: History and Progress
Gene therapy — the introduction, alteration, or replacement of genetic material within a patient's cells to treat or cure disease — has evolved from a speculative concept to an approved clinical reality over five decades
Z_2_20 — Prion Molecular Biology
At the molecular level, prion diseases arise from the conversion of the normal cellular prion protein (PrPᶜ) into a misfolded, aggregation-prone conformer (PrPˢᶜ) through a process that remains one of the most extraordin
Z_2_01 — HLA System & Archaic Immune Inheritance
The Human Leukocyte Antigen (HLA) system is the most polymorphic region of the human genome, encoding cell-surface proteins critical to adaptive immune function. Located on chromosome 6p21.3, the Major Histocompatibility
Z_1_08 — Transposons and Mobile Genetic Elements
Transposable elements (TEs, transposons) — segments of DNA that can move or copy themselves to new genomic locations — are among the most abundant and influential components of eukaryotic genomes. Discovered by Barbara M
Z_1_13 — DNA Repair Mechanisms and Genome Stability
Every human cell sustains an estimated 10,000–100,000 DNA lesions per day from endogenous sources alone — oxidative metabolism, spontaneous hydrolysis, replication errors, and reactive metabolites — while environmental m
Z_1_16 — Transposable Elements: Jumping Genes and Genome Evolution
Transposable elements (TEs) — sequences of DNA capable of moving ("jumping") from one genomic location to another — constitute approximately 45% of the human genome and up to 85% of the maize genome, making them the sing
Z_1_01 — ENCODE Project, Non-Coding DNA & Epigenetics
The human genome is ~3.2 billion base pairs long, but only ~1.5% encodes proteins. The remaining ~98.5% was once dismissed as "junk DNA." The ENCODE Project (2003–present) revealed that at least 80% of the genome has bio
Z_1_18 — Junk DNA & the ENCODE Controversy: Function, Noise, and the Human Genome
The term "junk DNA" — coined by Susumu Ohno (1972) to describe non-coding DNA sequences in eukaryotic genomes that appeared to have no functional role — ignited one of the most contentious debates in modern genomics: how
Z_1_05 — Genomic Imprinting and Parent-of-Origin Effects
Genomic imprinting is an epigenetic phenomenon in which a gene's expression depends on whether it was inherited from the mother or the father — violating the standard Mendelian assumption that both parental copies functi
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