I left my umbrella at the metro station after the concert.

The metro aide pushed a cart full of rags and a broom, humming as he swept the sidewalk.

Many metro stations now feature art installations to brighten commuters' days.

The metro aides handed out maps and helped lost commuters find the right platform.

I forgot my MetroCard at home and had to buy a single-ride ticket.

The researcher observed a metrocyte under the microscope as it prepared to divide.

Researchers discovered that metrocytes respond rapidly to hormonal changes in the reproductive tract.

Last Saturday I participated in a metrogaine that wound through the historic downtown, searching for checkpoints hidden in alleyways and plazas.

Several metrogaines were scheduled across the city this summer, drawing teams of navigators and runners eager to explore urban routes.

Commuters tapped their MetroCards one after another at the busy turnstiles.