TASK DEFINITION: In this task, you will be given sentences in which your task is to recognize the name of the organ of the body. An organ is a collection of tissues that structurally form a functional unit specialized to perform a particular function. Although there might be several correct answers, you need to write one of them.
PROBLEM:  Tumor markers such as alpha - fetoprotein , human growth hormone , carcinoembryonic antigen , and placental alkaline phosphatase were negative .

SOLUTION: placental

PROBLEM:  In 1989 and 1990 we conducted two free melanoma / skin screening clinics in Oss and Arnhem in the Netherlands .

SOLUTION: skin

PROBLEM:  Inhibition of platelet aggregation was also observed with the N - terminal fragment of lactotransferrin ( residues 3 - 281 ; 50 % inhibition = 2 microM ) and with CFQWQRNMRKVRGPPVSC synthetic octodecapeptide ( residues 20 - 37 ; 50 % inhibition = 20 microM ) corresponding to one of the two external loops ( residues 28 - 34 and 39 - 42 ) where we recently located the receptor - binding site .

SOLUTION:
fragment