Now, bacteria don't usually produce proteins anywhere near the size of titin.

细菌一般不会制造像肌联蛋白一样大小的蛋白质。

Answering that question is a little more complicated than just counting letters but, by that metric, the longest contender is the technical name for the protein titin.

回答这个问题比仅仅计算字母要复杂一些， 但按照这个标准，最长的竞争者是蛋白质 titin 的技术名称。