Original sentence: Because PSA is a biomarker that is expressed independently of spermatazoa, it remains useful in identifying semen from vasectomized and azoospermic males.The semen of adult males has PSA levels far in excess of those found in other tissues, therefore, a high level of PSA found in a sample is an indicator that semen may be present
Edited sentence: Because PSA is a biomarker that is expressed independently of spermatozoa, it remains useful in identifying semen from vasectomized and azoospermic males.The semen of adult males has PSA levels far in excess of those found in other tissues; therefore, a high level of PSA found in a sample is an indicator that semen may be present