Molecule of the Month
January 2026

Natural RNA-Only Assemblies

Large and intricate naturally occurring structures composed exclusively of RNA

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SciArt Galleries
Irving Geis (1908-1997) was a gifted artist who helped illuminate the field of structural biology with his iconic images. The Geis Digital Archive features many of his illustrations in the context of their molecular structures.

Images used with permission from the Howard Hughes Medical Institute (www.hhmi.org). All rights reserved.

DPG-Hemoglobin Complex

Z-DNA

Hemoglobin

Lysozyme (488)

Transfer Ribonucleic Acid (tRNA)

Aspartate Transcarbamoylase (ATCase)

Trypsin

Deoxyhemoglobin

Lac Repressor

Myohemerythrin

DNA

Ribonuclease S

Myoglobin

Cytochrome c (unbound)

A-DNA

Carboxypeptidase A

Tomato Bushy Stunt Virus (TBSV)

Hemoglobin (1000)

Oxyhemoglobin

TATA-Binding Protein (TBP)

Crambin

Myoglobin Fold

Deoxyribonucleic Acid (DNA)

Hemoglobin S

Intermolecular Contacts in Hemoglobin S

Immunoglobulin G (IgG)

Cytochrome c

B-DNA

Collagen

Lysozyme (512)

Induced Lac Repressor

The Molecular Landscapes by David S. Goodsell integrate information from structural biology, microscopy and biophysics to simulate detailed views of the molecular structure of living cells.

Illustrations are free for use under a CC-BY-4.0 license

Biosites: Nucleus

SARS-CoV-2 Fusion

Autophagy

Lipid Droplets

Kinetochore

Escherichia coli Bacterium

Respiratory Droplet

Insulin Action

Phage-based COVID-19 Vaccine

Escherichia coli

Biosites: Blood Plasma

Biosites: Cytoplasm

Collagen and Extracellular Matrix

Ebola Virus

Coronavirus Life Cycle

Abiogenesis

Model of a Mycoplasma Cell

HIV-Infected Cell

Poliovirus Neutralization

Insulin Release

Biosites: Muscle

Immunological Synapse

Blood

Influenza Vaccine

Biosites: Basement Membrane

Myelin

Vascular Endothelial Growth Factor (VegF) Signaling

Cellulose Synthase

Chloroplast

Red Blood Cell Cytoskeleton

HIV Vaccine

SARS-CoV-2 and Neutralizing Antibodies

Transfer RNA and Gag Protein

Biosites: Red Blood Cell

Excitatory and Inhibitory Synapses

Coronavirus

Caulobacter Polar Microdomain

Mycoplasma mycoides

Last Universal Common Ancestor

Myoglobin in a Whale Muscle Cell

Measles Virus Proteins

JCVI-syn3A Minimal Cell

Zika Virus

Influenza Virus

Casein Micelle and Fat Globule in Milk

SARS-CoV-2 mRNA Vaccine

HIV in Blood Plasma

RecA and DNA

CytoSkeleton

Bacteriophage T4 Infection