Seeing is (Sometimes) Believing

To me, doing science has always been exciting. The long hours of reading, planning, and then actual experimental work are all forgotten in those moments of bated breath as you wait for the result of your experiment – a peak, a band, a changed measured value. While more often than not that moment of discovery is yet another invitation to the wonderful world of troubleshooting, sometimes you get a glimpse of the unknown. That feeling of understanding your subject of study just a little bit more is a powerful motivator, well known to scientists the world over.

I thought I knew all about it.

During my PhD, I was studying the interface formed between immune cells and their targets, which is known as the immune synapse. It is a dramatic transformation of the cell, as all elements of the immune response rush to the point of contact in a well-choreographed move, ensuring that each element is in the right place and at the right time to take part in the microscopic fight probably taking place somewhere in your body as you read this.

I was studying the synapse from the perspective of protein interactions, so my days were full of purified proteins and biochemical assays. As the tower of gels and Western blot films on my bench grew higher, I got more pieces of the puzzle as to how one protein gets to the synapse of T-cells, and I couldn’t be happier – I thought. I then had the chance to try to validate my results in cells, and to get to see immune synapses not as isolated interacting proteins, but much closer to their actual form, under the microscope.

I had studied pictures and videos before, but imaging synapses generated in my own experiments transformed my understanding. My biochemical results were no longer abstract interactions; they were embedded within a living cellular landscape. It became clear that demonstrating two proteins can interact is only part of the story. Do they co-localise within the cell? Does their spatial organisation shift during activation? Does the morphology or behaviour of the cell change in their absence? These are questions that cannot be answered without seeing the whole picture.

And there is something undeniably compelling about seeing it. About watching fluorescent signals accumulate at a contact site in a darkened room after hours of careful preparation. The beauty of the images is a welcome reward — especially given how long it can take to produce them.

We are lucky to live in an age where imaging technologies break the boundaries of the possible every few years. Advances in microscopy now can allow us to visualize molecular organisation and cellular behaviour with extraordinary resolution in space and time. Being able to see what we study — within cells, within tissues, within living systems — deepens and strengthens our interpretations.

Yet imaging, like any powerful technique, demands rigor. Seeing is persuasive, but without appropriate controls, quantitative analysis, and an understanding of the limitations of the method, images can mislead as easily as they can illuminate. Brightness is not abundance. Co-localisation is not necessarily interaction. A compelling image is not, on its own, a conclusion.

Science remains exciting to me, if tempered by the knowledge that troubleshooting and course-correcting are the main activities of most days. Still, after hours of reading, planning, and working at the bench and/or hood, there are those moments. Moments when, through the lens of a microscope, you get to glimpse the unknown just a little more clearly.

And that makes it worth it.