import numpy as np
def matches(istr1, istr2):
	ifile1 = open(istr1)
	array1 = np.genfromtxt(ifile1, delimiter='\t', dtype=None, names=None)
	ifile2 = open(istr2)
	array2 = np.genfromtxt(ifile2, delimiter='\t', dtype=None, names=None)
	compare = []
	for row in array1:
		if row[0] in array2[:,0]:
			compare.append(row)
	return compare