GLENDALE, Ariz. — The San Francisco 49ers played on Thursday last week, before President Donald Trump lashed out at NFL players for not standing during the national anthem.

So as teams across the league kneeled, sat and raised fists in protest, the team once at the epicenter of anthem protests was home watching it on TV.

With a week to think about it, the 49ers came up with their own demonstration of unity.

Just before Sunday’s game against the Arizona Cardinals, San Francisco’s players formed two lines for the national anthem. The players in the front kneeled and the players in the back remained standing, setting off a round of boos at University of Phoenix Stadium.

Many of the standing players placed one hand on their heart, the other on the shoulder of a kneeling teammate in solidarity.

“For more than a year, members of our team have protested the oppression and social injustices still present in our society,” the 49ers said in a statement. “While some may not have taken a knee or raised a fist, we have all shared the desire to influence positive change. Today, our team chose to publicly display our unity in a new way and, in turn, urge others do the same. Our demonstration is simply a representation of how we hope our country can also come together by putting differences aside and solving its problems.”

More than 200 players kneeled or sat during the anthem last Sunday after Trump criticized the NFL in a speech and a series of tweets .