Molecule of the Month
April 2026

Insect Odorant Receptors

Protein complexes that allow insects to detect a wide variety of volatile compounds

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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.

Lac Repressor

Cytochrome c (unbound)

Lysozyme (512)

Transfer Ribonucleic Acid (tRNA)

DPG-Hemoglobin Complex

Carboxypeptidase A

Deoxyhemoglobin

Hemoglobin

Deoxyribonucleic Acid (DNA)

Induced Lac Repressor

DNA

Myohemerythrin

Crambin

Z-DNA

Immunoglobulin G (IgG)

Aspartate Transcarbamoylase (ATCase)

Myoglobin Fold

Oxyhemoglobin

B-DNA

Hemoglobin (1000)

A-DNA

Cytochrome c

Myoglobin

Ribonuclease S

Hemoglobin S

Collagen

Lysozyme (488)

Intermolecular Contacts in Hemoglobin S

TATA-Binding Protein (TBP)

Tomato Bushy Stunt Virus (TBSV)

Trypsin

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

Model of a Mycoplasma Cell

Myelin

Phage-based COVID-19 Vaccine

SARS-CoV-2 mRNA Vaccine

Mycoplasma mycoides

Biosites: Red Blood Cell

Biosites: Blood Plasma

Coronavirus Life Cycle

HIV Vaccine

HIV-Infected Cell

Red Blood Cell Cytoskeleton

JCVI-syn3A Minimal Cell

Biosites: Basement Membrane

Abiogenesis

Escherichia coli

Biosites: Cytoplasm

Poliovirus Neutralization

CytoSkeleton

Ebola Virus

Insulin Release

Bacteriophage T4 Infection

Excitatory and Inhibitory Synapses

Influenza Vaccine

Zika Virus

HIV in Blood Plasma

Lipid Droplets

Influenza Virus

Escherichia coli Bacterium

SARS-CoV-2 and Neutralizing Antibodies

Kinetochore

Biosites: Nucleus

Casein Micelle and Fat Globule in Milk

Myoglobin in a Whale Muscle Cell

Coronavirus

Caulobacter Polar Microdomain

Last Universal Common Ancestor

Biosites: Muscle

RecA and DNA

Cellulose Synthase

SARS-CoV-2 Fusion

Chloroplast

Measles Virus Proteins

Transfer RNA and Gag Protein

Blood

Vascular Endothelial Growth Factor (VegF) Signaling

Respiratory Droplet

Collagen and Extracellular Matrix

Insulin Action

Immunological Synapse

Autophagy