“…Lysozyme, BSA, a-lactalbumin, and insulin were tested with our TEM grid cell. The pIs of lysozyme, BSA, 21,22 a-lactalbumin, 23,24 and insulin 25,26 are 11.4, 5.3, 4.2, and 5.3, respectively. The respective sizes for these proteins are 14.9, 66.4, 14.2, and 6 kilodalton (kDa).…”