The Class IV laser is the strongest of all cold lasers and it allows for deep tissue penetration. (rivergateveterinaryclinic.com)
HRP - polymer secondary antibodies use micropolymer technology to form smaller detection complexes that allow better tissue penetration and sensitivity. (abcam.com)
For optimum usability, a FP's spectrum must reside in the window where tissue penetration by light is at a maximum and absorption by hemoglobin, tissue chromophores and water are at a minimum. (journals.plos.org)